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Michael S. Casey
Partner
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.
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.
Leo Cunningham
Partner
Leo is a former federal prosecutor who represents clients in sensitive litigation matters, including federal and state court trials.
Moe Fodeman
Partner
Moe is an experienced attorney in white collar criminal defense, U.S. SEC enforcement defense, compliance and regulatory matters, and complex civil litigation.
Caz Hashemi
Partner
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.
Tarek J. Helou
Partner
Tarek represents companies in internal investigations and defends companies and individuals in significant and multi-jurisdictional government enforcement actions.
Luis Li
Partner
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.
Melissa Mills
Partner
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.
Eli B. Richlin
Partner
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.
Sheryl Shapiro Bassin
Partner
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.
Brent Snyder
Partner
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.
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.
Michael S. Sommer
Partner
Michael focuses on white collar criminal defense and SEC enforcement defense, as well as complex commercial litigation and antitrust litigation.
Jessica L. Margolis
Partner Emeritus
Jessica Margolis retired as a partner at Wilson Sonsini Goodrich & Rosati in 2025. Jessica came to the firm in 2005 as one of the first attorneys resident in the New York Office and was elevated to partner in 2010. As a member of the Complex Litigation group, Jessica specialized in general commercial, intellectual property, and other complex litigation. Jessica has experience in all stages of the litigation process, from inception of an action through discovery, motion practice, trial, and appeal. She has significant experience litigating in federal and state courts, as well as representing clients in arbitration.
Catherine E. Moreno
Partner Emeritus
Catherine represented clients in securities and commercial litigation and investigations.
Steven M. Schatz
Partner Emeritus
Steve specializes in shareholder disputes and financial fraud matters, and is often called upon to counsel boards of directors and senior management on sensitive, confidential issues.
Wendy Huang Waszmer
Partner Emeritus
Wendy represented companies and individual clients in high-stakes antitrust and other government investigations, federal court litigation, and civil commercial disputes.