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White Collar Crime

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  • Experienced Defense Counsel

    Wilson Sonsini's litigators have experience defending clients facing numerous types of allegations, including fraud claims; price-fixing, bid-rigging, and other antitrust claims; corruption and bribery charges; consumer fraud claims; anti-kickback and whistleblower statute violations; and export controls and FCPA violations.

  • Federal Enforcement Agency Experience

    Wilson Sonsini's white collar defense attorneys have represented clients before all federal enforcement agencies, including the DOJ, SEC, FTC, CFTC, IRS, and FINRA, as well as in conjunction with criminal probes led by various state attorneys general.

  • Proven, Experienced Counsel

    Wilson Sonsini's team includes attorneys who previously served in U.S. Attorneys' Offices, the SEC, the DOJ, the NSD, and other prosecutor or regulatory enforcement posts, as well as former senior officials at major regulatory and judicial bodies in the areas of governance, securities laws, stock exchange rules, compliance, and corporate best practices.

  • Recognized Practitioners

    The firm's white collar defense attorneys have been recognized for their work on behalf of clients in business and legal media outlets, such as The American Lawyer, Chambers USA, and Law360.

Practice Dimension and Scope

Wilson Sonsini has an experienced team of attorneys, including former federal prosecutors and agency enforcement lawyers, who have represented companies and individuals under investigation for, or charged with, alleged violations of business-related federal and state criminal law.

Our attorneys have assisted clients facing all types of inquiries. For example, we have represented clients in informal inquiries involving purported errors and omissions and compliance matters, advising on initial fact-finding efforts, including responding to letters of inquiry or subpoenas. We have also represented clients in formal, official investigations, including parallel criminal and civil proceedings involving potentially significant financial penalties, loss of freedom, or other severe consequences.

We have defended clients facing various types of allegations, including:

  • Fraud (including accounting, securities, tax, healthcare, immigration, and mortgage fraud)
  • Price-fixing, bid-rigging, or other antitrust claims
  • Corruption and bribery charges
  • Consumer fraud claims
  • Anti-kickback and whistleblower statute violations
  • Academic fraud claims
  • Export controls violations
  • Foreign Corrupt Practices Act (FCPA) violations
  • National security-related matters

Collectively, our attorneys have represented clients before all federal enforcement agencies, including the Department of Justice (DOJ), the Securities and Exchange Commission (SEC), Federal Trade Commission (FTC), Commodity Futures Trading Commission (CFTC), Internal Revenue Service (IRS), and Financial Industry Regulatory Authority (FINRA). Our attorneys have also represented clients in conjunction with criminal probes led by various state attorneys general.

Generally, the types of clients who retain our representation in white collar criminal matters include corporate officers and executives, board directors, and other principals. In many cases, we have represented individuals who conduct business in highly competitive industries, including the technology, financial, pharmaceutical, energy, consumer, food, and retail sectors.

Investigations Experience

Wilson Sonsini has an experienced team of attorneys who have represented individuals in conjunction with government and internal investigations, including inquiries related to criminal allegations. We have assisted clients during all phases, from initial inquiries through the completion of investigations, as well as during any post-investigation proceedings or compliance obligations.

For more information about our investigations experience, please see our Government Investigations practice summary, or our Board and Internal Investigations practice summary.

Highly Relevant Subject-Matter Experience

Throughout its existence, Wilson Sonsini has had a sustained, robust transactional practice. That factor, combined with the heightened level of regulatory scrutiny, has given the firm's attorneys the opportunity to amass particular expertise in the following areas:

Financial and Accounting Fraud Matters and Investigations

Wilson Sonsini's attorneys have represented companies and their officers and directors in financial and accounting fraud matters and investigations, including inquiries related to accounting fraud allegations, restatements, financial reporting errors, disclosure issues, potential insider trading violations, and potential Foreign Corrupt Practices Act (FCPA) violations. In a majority of cases, matters involved the SEC and/or DOJ; however, Wilson Sonsini's attorneys have also represented clients during inquiries led by other enforcement agencies.

Foreign Corrupt Practices Act

The firm's investigations attorneys have gained significant experience representing clients in FCPA matters. In addition to designing and implementing comprehensive compliance programs, as well as training company representatives on FCPA compliance, our attorneys conduct internal FCPA investigations and risk assessments, advise on possible FCPA violations, and analyze related laws in foreign jurisdictions. When required, we also represent clients in enforcement actions and litigation involving FCPA and corruption issues. Finally, our investigations attorneys also conduct FCPA and anti-corruption due diligence investigations in conjunction with mergers, acquisitions, financings, and initial public offerings.

Antitrust - Civil Enforcement Investigations (FTC and DOJ)

Our attorneys have represented clients before the FTC and DOJ in connection with civil non-merger investigations for several years. We represent companies' interests before both agencies, either in connection with investigations into business practices or in assisting the agencies when investigating the conduct of others. For more information, please see our list of representative matters in this area.

Antitrust - Criminal Enforcement Investigations

We have successfully counseled clients on criminal antitrust issues and represented numerous companies and individuals in investigations and grand jury proceedings. Our team of antitrust and investigations practitioners have substantial experience handling international investigations, and we routinely represent foreign companies and executives before the DOJ and other competition bodies. For more information, please see our list of representative matters in this area.

Agency and Regulatory Experience

Criminal enforcement efforts and government investigations cause individuals defendants substantial disruption and pressure, regardless of the veracity of allegations. There is also the prospect of significant damage to one's reputation and overall well-being. The consequences of civil or criminal liability are infinitely serious for individual defendants. In short, individuals charged with allegations of wrongdoing depend heavily on proven, experienced legal counsel throughout the course of civil and/or criminal proceedings.

Wilson Sonsini's White Collar Criminal practice consists of senior-level practitioners who are subject-matter experts in highly relevant areas.

For example, Wilson Sonsini's attorneys have previously held significant roles in U.S. Attorneys' Offices, the SEC, the DOJ, the NSD, and other prosecutor or regulatory enforcement posts. Members of the team include:

  • A former federal prosecutor in the Criminal Division of the U.S. Attorney’s Office for the Eastern District of New York
  • A former assistant U.S. attorney in the Criminal Division of the U.S. Attorney’s Office for the Southern District of New York
  • A former federal criminal prosecutor for the Northern District of California
  • A former two-term member of the Advisory Committee on the Federal Rules of Criminal Procedure for the U.S. Judicial Conference, appointed by Chief Justice Roberts
  • A former enforcement attorney from the SEC’s Division of Enforcement

Wilson Sonsini's team also includes current and former senior officials at major regulatory and judicial bodies in the areas of governance, securities laws, stock exchange rules, compliance, and corporate best practices, including:

  • A former Chancellor of the Delaware Court of Chancery
  • A former Vice Chancellor of the Delaware Court of Chancery
  • The current chair of the NYSE Commission on Corporate Governance
  • A current member of the IPO (JOBS Act) Task Force created by the U.S. Treasury Department
  • A current member of the Advisory Board of the Securities Regulation Institute
  • A member of the SEC Advisory Committee on Smaller Public Companies
  • The current co-chair of the NASDAQ Listing and Hearing Review Council
  • The current chairman of the NYSE Enforcement and Listing Standards Committee

Other attorneys in Wilson Sonsini's White Collar Criminal practice are closely familiar with the board and board committee composition and independence considerations often tied to government investigations and criminal proceedings.

Overview

Practice Dimension and Scope

Wilson Sonsini has an experienced team of attorneys, including former federal prosecutors and agency enforcement lawyers, who have represented companies and individuals under investigation for, or charged with, alleged violations of business-related federal and state criminal law.

Our attorneys have assisted clients facing all types of inquiries. For example, we have represented clients in informal inquiries involving purported errors and omissions and compliance matters, advising on initial fact-finding efforts, including responding to letters of inquiry or subpoenas. We have also represented clients in formal, official investigations, including parallel criminal and civil proceedings involving potentially significant financial penalties, loss of freedom, or other severe consequences.

We have defended clients facing various types of allegations, including:

  • Fraud (including accounting, securities, tax, healthcare, immigration, and mortgage fraud)
  • Price-fixing, bid-rigging, or other antitrust claims
  • Corruption and bribery charges
  • Consumer fraud claims
  • Anti-kickback and whistleblower statute violations
  • Academic fraud claims
  • Export controls violations
  • Foreign Corrupt Practices Act (FCPA) violations
  • National security-related matters

Collectively, our attorneys have represented clients before all federal enforcement agencies, including the Department of Justice (DOJ), the Securities and Exchange Commission (SEC), Federal Trade Commission (FTC), Commodity Futures Trading Commission (CFTC), Internal Revenue Service (IRS), and Financial Industry Regulatory Authority (FINRA). Our attorneys have also represented clients in conjunction with criminal probes led by various state attorneys general.

Generally, the types of clients who retain our representation in white collar criminal matters include corporate officers and executives, board directors, and other principals. In many cases, we have represented individuals who conduct business in highly competitive industries, including the technology, financial, pharmaceutical, energy, consumer, food, and retail sectors.

Investigations Experience

Wilson Sonsini has an experienced team of attorneys who have represented individuals in conjunction with government and internal investigations, including inquiries related to criminal allegations. We have assisted clients during all phases, from initial inquiries through the completion of investigations, as well as during any post-investigation proceedings or compliance obligations.

For more information about our investigations experience, please see our Government Investigations practice summary, or our Board and Internal Investigations practice summary.

Highly Relevant Subject-Matter Experience

Throughout its existence, Wilson Sonsini has had a sustained, robust transactional practice. That factor, combined with the heightened level of regulatory scrutiny, has given the firm's attorneys the opportunity to amass particular expertise in the following areas:

Financial and Accounting Fraud Matters and Investigations

Wilson Sonsini's attorneys have represented companies and their officers and directors in financial and accounting fraud matters and investigations, including inquiries related to accounting fraud allegations, restatements, financial reporting errors, disclosure issues, potential insider trading violations, and potential Foreign Corrupt Practices Act (FCPA) violations. In a majority of cases, matters involved the SEC and/or DOJ; however, Wilson Sonsini's attorneys have also represented clients during inquiries led by other enforcement agencies.

Foreign Corrupt Practices Act

The firm's investigations attorneys have gained significant experience representing clients in FCPA matters. In addition to designing and implementing comprehensive compliance programs, as well as training company representatives on FCPA compliance, our attorneys conduct internal FCPA investigations and risk assessments, advise on possible FCPA violations, and analyze related laws in foreign jurisdictions. When required, we also represent clients in enforcement actions and litigation involving FCPA and corruption issues. Finally, our investigations attorneys also conduct FCPA and anti-corruption due diligence investigations in conjunction with mergers, acquisitions, financings, and initial public offerings.

Antitrust - Civil Enforcement Investigations (FTC and DOJ)

Our attorneys have represented clients before the FTC and DOJ in connection with civil non-merger investigations for several years. We represent companies' interests before both agencies, either in connection with investigations into business practices or in assisting the agencies when investigating the conduct of others. For more information, please see our list of representative matters in this area.

Antitrust - Criminal Enforcement Investigations

We have successfully counseled clients on criminal antitrust issues and represented numerous companies and individuals in investigations and grand jury proceedings. Our team of antitrust and investigations practitioners have substantial experience handling international investigations, and we routinely represent foreign companies and executives before the DOJ and other competition bodies. For more information, please see our list of representative matters in this area.

Agency and Regulatory Experience

Criminal enforcement efforts and government investigations cause individuals defendants substantial disruption and pressure, regardless of the veracity of allegations. There is also the prospect of significant damage to one's reputation and overall well-being. The consequences of civil or criminal liability are infinitely serious for individual defendants. In short, individuals charged with allegations of wrongdoing depend heavily on proven, experienced legal counsel throughout the course of civil and/or criminal proceedings.

Wilson Sonsini's White Collar Criminal practice consists of senior-level practitioners who are subject-matter experts in highly relevant areas.

For example, Wilson Sonsini's attorneys have previously held significant roles in U.S. Attorneys' Offices, the SEC, the DOJ, the NSD, and other prosecutor or regulatory enforcement posts. Members of the team include:

  • A former federal prosecutor in the Criminal Division of the U.S. Attorney’s Office for the Eastern District of New York
  • A former assistant U.S. attorney in the Criminal Division of the U.S. Attorney’s Office for the Southern District of New York
  • A former federal criminal prosecutor for the Northern District of California
  • A former two-term member of the Advisory Committee on the Federal Rules of Criminal Procedure for the U.S. Judicial Conference, appointed by Chief Justice Roberts
  • A former enforcement attorney from the SEC’s Division of Enforcement

Wilson Sonsini's team also includes current and former senior officials at major regulatory and judicial bodies in the areas of governance, securities laws, stock exchange rules, compliance, and corporate best practices, including:

  • A former Chancellor of the Delaware Court of Chancery
  • A former Vice Chancellor of the Delaware Court of Chancery
  • The current chair of the NYSE Commission on Corporate Governance
  • A current member of the IPO (JOBS Act) Task Force created by the U.S. Treasury Department
  • A current member of the Advisory Board of the Securities Regulation Institute
  • A member of the SEC Advisory Committee on Smaller Public Companies
  • The current co-chair of the NASDAQ Listing and Hearing Review Council
  • The current chairman of the NYSE Enforcement and Listing Standards Committee

Other attorneys in Wilson Sonsini's White Collar Criminal practice are closely familiar with the board and board committee composition and independence considerations often tied to government investigations and criminal proceedings.

Alerts
Takeaways from the Maduro Raid Prediction Market Indictment
On April 23, 2026, the Commodity Futures Trading Commission (CFTC) and the U.S. Attorney’s Office for the Southern District of New York (SDNY) brought parallel civil and criminal charges against U.S. Army Master Sergeant Gannon Ken Van Dyke related to insider trading in connection with event contracts used in prediction markets. The civil complaint marks the first-ever insider trading case brought by the CFTC involving event contracts in prediction markets.
Alerts
DOJ Expands Corporate Enforcement Policy Department-Wide for Consistent Corporate Crime Compliance
The U.S. Department of Justice (DOJ) has taken another step toward standardizing corporate crime enforcement by adopting a department-wide Corporate Enforcement Policy (DOJ CEP). This client alert summarizes the new DOJ CEP and analyzes how companies can expect corporate criminal resolutions to proceed under this new unified policy.
Alerts
DOJ Antitrust Division Makes First Whistleblower Payment for Reporting Antitrust Crime
On January 29, 2026, the U.S. Department of Justice’s (DOJ) Antitrust Division announced the first payment made under its Whistleblower Rewards Program. The whistleblower received a reward of $1 million for providing information that led to a company agreeing to pay a $3.28 million criminal fine to resolve antitrust and fraud charges.
Alerts
DOJ Indicts Former Senior Manager of Federal Contractor over Alleged Misrepresentations Concerning FedRAMP/DoD Cybersecurity Compliance
On December 10, 2025, the U.S. Department of Justice (DOJ) announced that Danielle Hillmer, a former senior manager at a government contractor, was indicted for falsely claiming that her employer had implemented required security controls and obstructing an audit by concealing deficiencies in the system. Hillmer’s employer was a Virginia-based government contractor that provided cloud computing services to federal agencies, including the U.S. Department of the Army, the U.S. Department of Veterans Affairs, and the U.S. Department of State.
News Articles
Daily Journal Names Caz Hashemi Among 2025 Top White Collar Lawyers
On December 10, 2025, for the fifth consecutive year, Wilson Sonsini's Caz Hashemi was named to Daily Journal's "Top White Collar Lawyers," an annual list honoring the top performing attorneys specializing in white-collar defense. Caz began his career as an enforcement attorney at the SEC and that experience drew him to the defense side of the practice and the broader intersection of law, business, and technology. During his career, he has represented numerous companies, boards, and special committees in government and internal investigations, as well as related litigation.
News Articles
Wilson Sonsini Recognized Among Leading Law Firms in 2025 GIR 100
Wilson Sonsini Goodrich & Rosati has been named among the leading global law firms in Global Investigations Review’s 2025 GIR 100 guide, profiling the best firms for companies and executives to call on during high-stakes corporate investigations. GIR’s research and editorial teams selected the top 100 firms handling multilayered and intricate investigations based on rigorous market research, data, submissions, and insights. The result is an in-depth survey of the best-performing investigations practices, specialist white-collar defense firms, and consulting businesses in the world.
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Insights
Alerts
Takeaways from the Maduro Raid Prediction Market Indictment
On April 23, 2026, the Commodity Futures Trading Commission (CFTC) and the U.S. Attorney’s Office for the Southern District of New York (SDNY) brought parallel civil and criminal charges against U.S. Army Master Sergeant Gannon Ken Van Dyke related to insider trading in connection with event contracts used in prediction markets. The civil complaint marks the first-ever insider trading case brought by the CFTC involving event contracts in prediction markets.
Alerts
DOJ Expands Corporate Enforcement Policy Department-Wide for Consistent Corporate Crime Compliance
The U.S. Department of Justice (DOJ) has taken another step toward standardizing corporate crime enforcement by adopting a department-wide Corporate Enforcement Policy (DOJ CEP). This client alert summarizes the new DOJ CEP and analyzes how companies can expect corporate criminal resolutions to proceed under this new unified policy.
Alerts
DOJ Antitrust Division Makes First Whistleblower Payment for Reporting Antitrust Crime
On January 29, 2026, the U.S. Department of Justice’s (DOJ) Antitrust Division announced the first payment made under its Whistleblower Rewards Program. The whistleblower received a reward of $1 million for providing information that led to a company agreeing to pay a $3.28 million criminal fine to resolve antitrust and fraud charges.
Alerts
DOJ Indicts Former Senior Manager of Federal Contractor over Alleged Misrepresentations Concerning FedRAMP/DoD Cybersecurity Compliance
On December 10, 2025, the U.S. Department of Justice (DOJ) announced that Danielle Hillmer, a former senior manager at a government contractor, was indicted for falsely claiming that her employer had implemented required security controls and obstructing an audit by concealing deficiencies in the system. Hillmer’s employer was a Virginia-based government contractor that provided cloud computing services to federal agencies, including the U.S. Department of the Army, the U.S. Department of Veterans Affairs, and the U.S. Department of State.
News Articles
Daily Journal Names Caz Hashemi Among 2025 Top White Collar Lawyers
On December 10, 2025, for the fifth consecutive year, Wilson Sonsini's Caz Hashemi was named to Daily Journal's "Top White Collar Lawyers," an annual list honoring the top performing attorneys specializing in white-collar defense. Caz began his career as an enforcement attorney at the SEC and that experience drew him to the defense side of the practice and the broader intersection of law, business, and technology. During his career, he has represented numerous companies, boards, and special committees in government and internal investigations, as well as related litigation.
News Articles
Wilson Sonsini Recognized Among Leading Law Firms in 2025 GIR 100
Wilson Sonsini Goodrich & Rosati has been named among the leading global law firms in Global Investigations Review’s 2025 GIR 100 guide, profiling the best firms for companies and executives to call on during high-stakes corporate investigations. GIR’s research and editorial teams selected the top 100 firms handling multilayered and intricate investigations based on rigorous market research, data, submissions, and insights. The result is an in-depth survey of the best-performing investigations practices, specialist white-collar defense firms, and consulting businesses in the world.
View All
WSGR Events
Internal Investigations: Advanced Issues for In-House Counsel — Privilege, Process, and Judgment at the Margins
In today’s heightened regulatory environment, internal investigations are no longer just reactive exercises—they are critical strategic tools that demand careful judgment, rigorous process, and vigilant privilege protection. Join Wilson Sonsini in Salt Lake City on Tuesday, June 23, for a lunchtime CLE program designed for in-house counsel navigating the most demanding investigation scenarios. 
Affiliated Programs
Securities Enforcement Forum West 2026
Wilson Sonsini is proud to sponsor Securities Enforcement Forum West on May 21, 2026, at the Palace Hotel in San Francisco, with an option for attendees to view the event live online. This one-day conference brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel, compliance executives, and other top professionals in the field to discuss the most pressing topics in securities enforcement. Key discussion points will include financial and accounting fraud, the impact of artificial intelligence (AI), advanced litigation and investigation strategies, managing SEC-related criminal matters, cryptocurrency, whistleblowers, insider trading, cybersecurity, and much more.
Speaking Engagements
ABA's International Law Section's 2026 Annual Conference
Wilson Sonsini litigation partner Tarek J. Helou will speak at the American Bar Association International Law Section’s 2026 Annual Conference, on May 12–14 in Washington, D.C. This conference brings together 600+ lawyers from five continents for high-level programs on cross-border legal and business developments, with a particular focus on enforcement, compliance, and the rule of law.
Speaking Engagements
Securities Enforcement Forum West 2025
Securities Enforcement Forum West brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel and compliance executives, and other top professionals in the field. This year’s conference will be held on Thursday, May 15, 2025, and will also be available for attendees to view live online.
Speaking Engagements
ACI’s 20th Annual FCPA & Anti-Corruption for the Life Sciences Industry
Wilson Sonsini Litigation partner Tarek Helou will co-present “Managing the Risks of Government-Run Healthcare Systems: Mitigating Global Corruption and More Potential Exposure in Drug and Device Research, Testing and Approvals in Foreign Jurisdictions” on Thursday, May 8 at 3 p.m. EST at American Conference Institute’s (ACI) 20th Annual FCPA & Anti-Corruption for the Life Sciences Industry event. Topics include:
Affiliated Programs
PLI’s Foreign Corrupt Practices Act and International Anti-Corruption Developments 2025
Wilson Sonsini Litigation partner Tarek Helou will serve on a panel titled “President Trump’s Executive Order on the FCPA, the Attorney General’s February 5th Memo, and What May Happen Next” at PLI’s The Foreign Corrupt Practices Act and International Anti-Corruption Developments 2025 program. The session, taking place at 9:15 a.m. EST on Wednesday, April 9, will cover:
View All
Events
WSGR Events
Internal Investigations: Advanced Issues for In-House Counsel — Privilege, Process, and Judgment at the Margins
In today’s heightened regulatory environment, internal investigations are no longer just reactive exercises—they are critical strategic tools that demand careful judgment, rigorous process, and vigilant privilege protection. Join Wilson Sonsini in Salt Lake City on Tuesday, June 23, for a lunchtime CLE program designed for in-house counsel navigating the most demanding investigation scenarios. 
Affiliated Programs
Securities Enforcement Forum West 2026
Wilson Sonsini is proud to sponsor Securities Enforcement Forum West on May 21, 2026, at the Palace Hotel in San Francisco, with an option for attendees to view the event live online. This one-day conference brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel, compliance executives, and other top professionals in the field to discuss the most pressing topics in securities enforcement. Key discussion points will include financial and accounting fraud, the impact of artificial intelligence (AI), advanced litigation and investigation strategies, managing SEC-related criminal matters, cryptocurrency, whistleblowers, insider trading, cybersecurity, and much more.
Speaking Engagements
ABA's International Law Section's 2026 Annual Conference
Wilson Sonsini litigation partner Tarek J. Helou will speak at the American Bar Association International Law Section’s 2026 Annual Conference, on May 12–14 in Washington, D.C. This conference brings together 600+ lawyers from five continents for high-level programs on cross-border legal and business developments, with a particular focus on enforcement, compliance, and the rule of law.
Speaking Engagements
Securities Enforcement Forum West 2025
Securities Enforcement Forum West brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel and compliance executives, and other top professionals in the field. This year’s conference will be held on Thursday, May 15, 2025, and will also be available for attendees to view live online.
Speaking Engagements
ACI’s 20th Annual FCPA & Anti-Corruption for the Life Sciences Industry
Wilson Sonsini Litigation partner Tarek Helou will co-present “Managing the Risks of Government-Run Healthcare Systems: Mitigating Global Corruption and More Potential Exposure in Drug and Device Research, Testing and Approvals in Foreign Jurisdictions” on Thursday, May 8 at 3 p.m. EST at American Conference Institute’s (ACI) 20th Annual FCPA & Anti-Corruption for the Life Sciences Industry event. Topics include:
Affiliated Programs
PLI’s Foreign Corrupt Practices Act and International Anti-Corruption Developments 2025
Wilson Sonsini Litigation partner Tarek Helou will serve on a panel titled “President Trump’s Executive Order on the FCPA, the Attorney General’s February 5th Memo, and What May Happen Next” at PLI’s The Foreign Corrupt Practices Act and International Anti-Corruption Developments 2025 program. The session, taking place at 9:15 a.m. EST on Wednesday, April 9, will cover:
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Michael S. Casey
Partner
London
Mike Casey is a dual-qualified, Chambers-ranked (Band 1) partner in Wilson Sonsini Goodrich & Rosati’s London office. His practice focuses on advising clients on sanctions, export controls, anti-corruption, and anti-money laundering issues in investigations, counseling, and compliance matters. In addition, he regularly acts as a specialist in mergers, acquisitions, venture financings, lending arrangements, and other types of corporate transactions. He also frequently advises clients on the UK’s National Security and Investment Act and other foreign direct investment review regimes.

Chambers UK noted that Mike is “a one-stop shop for global sanctions advice” who is “very responsive with his provision of highly commercial advice.” The publication also described Mike as “one of the most experienced practitioners in the market” who “understands and takes into consideration any necessary complexities and understands the importance of commerciality when giving recommendations.”

Mike has led numerous internal and government-initiated investigations involving potential violations of sanctions, export controls, anti-money laundering laws, anti-bribery laws, and fraud laws throughout the world. He has also represented individuals in pending and threatened litigation.

Mike regularly advises clients on a wide range of compliance issues. He works with clients to develop and implement state-of-the-art compliance programs, including corporate policies, training programs, and third-party procedures. Further, Mike assists clients with carrying out due diligence for many types of corporate transactions. He has successfully guided dozens of investors and companies through the NSI Act review process.

Prior to joining Wilson Sonsini, Mike was a partner in the London office of Kirkland & Ellis.

Mike is the author of Sanctions Enforcement and Compliance: A Practitioner’s Guide to OFAC, a treatise published by Bloomberg BNA. Additionally, leading legal publications have published more than 45 of his articles. He has been quoted in numerous publications, including The Wall Street Journal, The New York Times, and Global Investigations Review.
  • National Security and Trade
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Leo Cunningham
Partner
Palo Alto
Leo is a former federal prosecutor who represents clients in sensitive litigation matters, including federal and state court trials.
  • Litigation
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Moe Fodeman
Partner
New York
Moe is an experienced attorney in white collar criminal defense, U.S. SEC enforcement defense, compliance and regulatory matters, and complex civil litigation.
  • Litigation
View Profile
Caz Hashemi
Partner
Palo Alto
Caz is head of Wilson Sonsini’s litigation department and a member of the firm’s board of directors. He is nationally recognized as one of the top attorneys in his field of practice, regularly representing clients in high stakes securities litigation and government investigation matters. 
  • Litigation
View Profile
Tarek J. Helou
Partner
Washington, D.C.
Tarek represents companies in internal investigations and defends companies and individuals in significant and multi-jurisdictional government enforcement actions.
  • Litigation
View Profile
Luis Li
Partner
Los Angeles
An accomplished trial lawyer and fellow of the American College of Trial Lawyers, Luis Li has led and played an integral role in numerous high-stakes, high-profile trials for a wide range of clients and has tried dozens of cases to verdict in state and federal courts across the country. He currently serves as the lead trial lawyer representing YouTube and Google in the first landmark bellwether case asserting claims against social media companies for the allegedly addictive design of their platforms. Luis is consistently recognized in the Chambers USA guide, where his clients have described him as “Spectacular in court with a limitless pool of skills – down to earth and can talk to a jury” and as a “Top trial lawyer - just outstanding on his feet in front of a jury in court.” His experience includes complex business litigation, corporate crisis management, internal investigations, white collar criminal defense, and international enforcement matters. Luis has represented a variety of leading companies and individuals across a range of industries, including technology, biotech, aerospace, media and entertainment, sports, oil and gas, social media, and cultural institutions. His background as a former assistant United States attorney has served to establish him as a trusted advisor for the most complex cases and sensitive internal corporate investigations.
  • Litigation
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Melissa Mills
Partner
Los Angeles
Melissa Mills is a litigation partner in the Los Angeles and Washington, D.C., offices of Wilson Sonsini Goodrich & Rosati, where she is a member of the firm’s national team of trial lawyers known for its success in litigating cutting-edge disputes in technology, intellectual property, and other areas. She is a co-chair of the firm’s complex litigation practice and a member of the board of directors of the Wilson Sonsini Foundation.
  • Litigation
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Eli B. Richlin
Partner
New York
Eli Richlin practices in the New York office of Wilson Sonsini Goodrich & Rosati, where he maintains a broad practice focused on litigation pending in New York federal and state courts covering general commercial matters, intellectual property disputes, white collar criminal defense and internal investigations, and government and regulatory enforcement proceedings.
  • Litigation
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Sheryl Shapiro Bassin
Partner
New York
Sheryl Shapiro Bassin is a partner in the New York office of Wilson Sonsini Goodrich & Rosati. Her practice focuses on securities litigation, complex commercial litigation, corporate governance litigation, and white-collar criminal defense. Sheryl represents companies and their directors and officers in stockholder class actions, derivative suits, and complex commercial litigation in federal and state courts throughout the country. She also has extensive experience representing financial institutions, public and private companies, and individuals in a wide range of civil litigation encompassing many areas of law, including fraud, contract, and intellectual property, in federal and state courts and in arbitration matters. She has represented clients in regulatory matters involving federal, state, and foreign authorities and conducted internal investigations.
  • Litigation
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Brent Snyder
Partner
San Francisco
Brent Snyder, head of the firm's regulatory and compliance department, brings more than 30 years of civil and criminal litigation and trial experience in both the private and public sectors. He is widely regarded as one of the world’s leading authorities on antitrust and competition enforcement in the area of antitrust cartels and related criminal violations. Brent has secured positive outcomes for leading companies and individual executives across industries in investigations by the U.S. Department of Justice (DOJ) and other antitrust enforcers, all while ensuring minimal business disruptions. 

Prior to joining the firm, Brent served as chief executive officer of the Hong Kong Competition Commission (HKCC), where he had day-to-day responsibility for all aspects of its enforcement, policy, advocacy, and administration functions. Under his leadership, the HKCC set several important litigation precedents; significantly increased the volume, variety, and complexity of its enforcement work; improved its leniency and cooperation incentives; and enhanced its competition policy and advocacy work.
  • Antitrust and Competition
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People
Michael S. Casey
Partner
London
Mike Casey is a dual-qualified, Chambers-ranked (Band 1) partner in Wilson Sonsini Goodrich & Rosati’s London office. His practice focuses on advising clients on sanctions, export controls, anti-corruption, and anti-money laundering issues in investigations, counseling, and compliance matters. In addition, he regularly acts as a specialist in mergers, acquisitions, venture financings, lending arrangements, and other types of corporate transactions. He also frequently advises clients on the UK’s National Security and Investment Act and other foreign direct investment review regimes.

Chambers UK noted that Mike is “a one-stop shop for global sanctions advice” who is “very responsive with his provision of highly commercial advice.” The publication also described Mike as “one of the most experienced practitioners in the market” who “understands and takes into consideration any necessary complexities and understands the importance of commerciality when giving recommendations.”

Mike has led numerous internal and government-initiated investigations involving potential violations of sanctions, export controls, anti-money laundering laws, anti-bribery laws, and fraud laws throughout the world. He has also represented individuals in pending and threatened litigation.

Mike regularly advises clients on a wide range of compliance issues. He works with clients to develop and implement state-of-the-art compliance programs, including corporate policies, training programs, and third-party procedures. Further, Mike assists clients with carrying out due diligence for many types of corporate transactions. He has successfully guided dozens of investors and companies through the NSI Act review process.

Prior to joining Wilson Sonsini, Mike was a partner in the London office of Kirkland & Ellis.

Mike is the author of Sanctions Enforcement and Compliance: A Practitioner’s Guide to OFAC, a treatise published by Bloomberg BNA. Additionally, leading legal publications have published more than 45 of his articles. He has been quoted in numerous publications, including The Wall Street Journal, The New York Times, and Global Investigations Review.
  • National Security and Trade
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Leo Cunningham
Partner
Palo Alto
Leo is a former federal prosecutor who represents clients in sensitive litigation matters, including federal and state court trials.
  • Litigation
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Moe Fodeman
Partner
New York
Moe is an experienced attorney in white collar criminal defense, U.S. SEC enforcement defense, compliance and regulatory matters, and complex civil litigation.
  • Litigation
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Caz Hashemi
Partner
Palo Alto
Caz is head of Wilson Sonsini’s litigation department and a member of the firm’s board of directors. He is nationally recognized as one of the top attorneys in his field of practice, regularly representing clients in high stakes securities litigation and government investigation matters. 
  • Litigation
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Tarek J. Helou
Partner
Washington, D.C.
Tarek represents companies in internal investigations and defends companies and individuals in significant and multi-jurisdictional government enforcement actions.
  • Litigation
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Luis Li
Partner
Los Angeles
An accomplished trial lawyer and fellow of the American College of Trial Lawyers, Luis Li has led and played an integral role in numerous high-stakes, high-profile trials for a wide range of clients and has tried dozens of cases to verdict in state and federal courts across the country. He currently serves as the lead trial lawyer representing YouTube and Google in the first landmark bellwether case asserting claims against social media companies for the allegedly addictive design of their platforms. Luis is consistently recognized in the Chambers USA guide, where his clients have described him as “Spectacular in court with a limitless pool of skills – down to earth and can talk to a jury” and as a “Top trial lawyer - just outstanding on his feet in front of a jury in court.” His experience includes complex business litigation, corporate crisis management, internal investigations, white collar criminal defense, and international enforcement matters. Luis has represented a variety of leading companies and individuals across a range of industries, including technology, biotech, aerospace, media and entertainment, sports, oil and gas, social media, and cultural institutions. His background as a former assistant United States attorney has served to establish him as a trusted advisor for the most complex cases and sensitive internal corporate investigations.
  • Litigation
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Melissa Mills
Partner
Los Angeles
Melissa Mills is a litigation partner in the Los Angeles and Washington, D.C., offices of Wilson Sonsini Goodrich & Rosati, where she is a member of the firm’s national team of trial lawyers known for its success in litigating cutting-edge disputes in technology, intellectual property, and other areas. She is a co-chair of the firm’s complex litigation practice and a member of the board of directors of the Wilson Sonsini Foundation.
  • Litigation
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Eli B. Richlin
Partner
New York
Eli Richlin practices in the New York office of Wilson Sonsini Goodrich & Rosati, where he maintains a broad practice focused on litigation pending in New York federal and state courts covering general commercial matters, intellectual property disputes, white collar criminal defense and internal investigations, and government and regulatory enforcement proceedings.
  • Litigation
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Sheryl Shapiro Bassin
Partner
New York
Sheryl Shapiro Bassin is a partner in the New York office of Wilson Sonsini Goodrich & Rosati. Her practice focuses on securities litigation, complex commercial litigation, corporate governance litigation, and white-collar criminal defense. Sheryl represents companies and their directors and officers in stockholder class actions, derivative suits, and complex commercial litigation in federal and state courts throughout the country. She also has extensive experience representing financial institutions, public and private companies, and individuals in a wide range of civil litigation encompassing many areas of law, including fraud, contract, and intellectual property, in federal and state courts and in arbitration matters. She has represented clients in regulatory matters involving federal, state, and foreign authorities and conducted internal investigations.
  • Litigation
View Profile
Brent Snyder
Partner
San Francisco
Brent Snyder, head of the firm's regulatory and compliance department, brings more than 30 years of civil and criminal litigation and trial experience in both the private and public sectors. He is widely regarded as one of the world’s leading authorities on antitrust and competition enforcement in the area of antitrust cartels and related criminal violations. Brent has secured positive outcomes for leading companies and individual executives across industries in investigations by the U.S. Department of Justice (DOJ) and other antitrust enforcers, all while ensuring minimal business disruptions. 

Prior to joining the firm, Brent served as chief executive officer of the Hong Kong Competition Commission (HKCC), where he had day-to-day responsibility for all aspects of its enforcement, policy, advocacy, and administration functions. Under his leadership, the HKCC set several important litigation precedents; significantly increased the volume, variety, and complexity of its enforcement work; improved its leniency and cooperation incentives; and enhanced its competition policy and advocacy work.
  • Antitrust and Competition
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Related Practices
  • Litigation
  • FCPA and Anti-Corruption
  • Government Investigations
  • Securities Litigation
  • Trial
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Takeaways from the Maduro Raid Prediction Market Indictment
On April 23, 2026, the Commodity Futures Trading Commission (CFTC) and the U.S. Attorney’s Office for the Southern District of New York (SDNY) brought parallel civil and criminal charges against U.S. Army Master Sergeant Gannon Ken Van Dyke related to insider trading in connection with event contracts used in prediction markets. The civil complaint marks the first-ever insider trading case brought by the CFTC involving event contracts in prediction markets.
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DOJ Expands Corporate Enforcement Policy Department-Wide for Consistent Corporate Crime Compliance
The U.S. Department of Justice (DOJ) has taken another step toward standardizing corporate crime enforcement by adopting a department-wide Corporate Enforcement Policy (DOJ CEP). This client alert summarizes the new DOJ CEP and analyzes how companies can expect corporate criminal resolutions to proceed under this new unified policy.
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Internal Investigations: Advanced Issues for In-House Counsel — Privilege, Process, and Judgment at the Margins
In today’s heightened regulatory environment, internal investigations are no longer just reactive exercises—they are critical strategic tools that demand careful judgment, rigorous process, and vigilant privilege protection. Join Wilson Sonsini in Salt Lake City on Tuesday, June 23, for a lunchtime CLE program designed for in-house counsel navigating the most demanding investigation scenarios. 
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Securities Enforcement Forum West 2026
Wilson Sonsini is proud to sponsor Securities Enforcement Forum West on May 21, 2026, at the Palace Hotel in San Francisco, with an option for attendees to view the event live online. This one-day conference brings together hundreds of current and former senior SEC officials, securities enforcement and white-collar attorneys, in-house counsel, compliance executives, and other top professionals in the field to discuss the most pressing topics in securities enforcement. Key discussion points will include financial and accounting fraud, the impact of artificial intelligence (AI), advanced litigation and investigation strategies, managing SEC-related criminal matters, cryptocurrency, whistleblowers, insider trading, cybersecurity, and much more.
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