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Aaron D. Hendelman
Partner
Seattle
Aaron heads the firm's trademark and advertising practice, focusing on the areas of trademark, advertising, unfair competition, copyright, retail, rights of publicity, social media, and consumer law.
  • Trademark and Advertising
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Alyssa M. Worsham
Partner
Seattle
Alyssa Worsham is a member of the firm’s trademark and advertising team, which has been recognized in Chambers and Partners’ USA and Global guides, as well as World Trademark Review’s WTR 1000. She focuses on global strategic advice, litigation strategy, and transactional guidance for clients’ trademarks, branding, and advertising in marketplaces where commercial and geographic lines are increasingly blurring. She helps clients assess the risk in selecting new business and product names, and works with them to build, exploit, and protect these names creatively and strategically. Alyssa advises on trademark disputes, domain name disputes, contests and sweepstakes, advertising review, right of publicity, social media issues, Telephone Consumer Protection Act (TCPA) compliance (i.e., the rules surrounding marketing texts and calls), FTC compliance and investigations, copyright, IP diligence, and associated commercial contracts. She works with software companies, biotech start-ups, cosmetics companies, fashion companies, life sciences and digital health companies, agro-tech companies, consumer products, non-profits, and game developers, among others. She advises founders, CEOs, GCs, IP specialists, and chief marketing officers on the critical issues surrounding brand creation, protection, and strategy.
  • Trademark and Advertising
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Christine K. Au-Yeung
Partner
San Francisco
Christine Au-Yeung is a partner in the San Francisco and Palo Alto offices of Wilson Sonsini Goodrich & Rosati, where she specializes in trademark, copyright, and advertising law. She counsels clients on all aspects of brand protection in the U.S. and throughout the world, including clearance and selection of trademarks, prosecution of trademark applications, licensing, and the resolution of trademark infringement and domain name disputes. She also advises clients on advertising issues, including TCPA compliance related to marketing calls and texts as well as strategies on promotions such as sweepstakes and contests.
  • Trademark and Advertising
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Brandon P. Leahy
Senior Counsel
San Francisco
Brandon Leahy is senior counsel in the San Francisco office of Wilson Sonsini Goodrich & Rosati, where he practices trademark, copyright, and advertising law. He advises clients on all aspects of brand protection and enforcement in the U.S. and internationally, including clearance and selection of trademarks, prosecution of trademark applications, and licensing and transactions. He also represents clients in federal court litigation, in disputes before the Trademark Trial and Appeal Board, and in arbitration proceedings involving domain names.
  • Trademark and Advertising
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John P. Flynn
Partner
San Francisco
John is a veteran trial lawyer with 30 years of experience in high-stakes, enterprise-threatening corporate and commercial litigation.
  • Litigation
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Daniel Glazer
Partner
London
Daniel counsels UK and European tech and life sciences companies on U.S. expansion and fundraising.
  • Corporate
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Gary R. Greenstein
Partner
Washington, D.C.
Gary represents companies in transactions with record labels, music publishers, and program suppliers focusing on intellectual property, licensing, and commercial transactions.
  • Technology Transactions
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Maura L. Rees
Partner
Palo Alto
Maura is an experienced litigator who represents clients in complex commercial litigation and IP-related disputes, including copyright, trademark, patent, and antitrust matters, as well as consumer class actions.
  • Litigation
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Brian M. Willen
Partner
New York
Brian represents companies facing challenging disputes involving novel issues of law. 
  • Litigation
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John L. Slafsky
Partner Emeritus
John Slafsky retired as partner at Wilson Sonsini in 2025.
  • Trademark and Advertising
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Camila Chabayta
Associate
San Francisco
Camila Chabayta is an associate in the San Francisco office of Wilson Sonsini Goodrich & Rosati, where she focuses on trademark and advertising law. She counsels clients on a variety of brand protection and enforcement matters, including trademark clearance and selection, trademark prosecution, domain name disputes, and advertising issues.
  • Trademark and Advertising
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Chloe Delehanty
Associate
San Diego
Chloe Delehanty is an associate in the trademark and advertising group in the San Diego office of Wilson Sonsini Goodrich & Rosati.
  • Trademark and Advertising
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Emily (Emma) Elder
Associate
Seattle
Emma Elder is an associate in the Seattle office of Wilson Sonsini Goodrich & Rosati, where she focuses on trademark and advertising law. Emma advises clients on brand protection and enforcement, trademark clearance and selection, domain name disputes, copyright protection and enforcement, and advertising matters.
  • Trademark and Advertising
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Silvia Francis-Bongue
Associate
San Francisco
Silvia Francis-Bongue is an associate in the San Francisco office of Wilson Sonsini Goodrich & Rosati, where she specializes in trademark, copyright, and advertising law. She counsels early-stage start-ups and fortune 500 companies on brand protection in the U.S. and throughout the world, including clearance and prosecution of trademarks and brand enforcement matters. Silvia also handles domain name disputes and advises clients on advertising issues.
  • Trademark and Advertising
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Allie Huff
Associate
Allie Huff is an associate at Wilson Sonsini Goodrich & Rosati, where she specializes in trademarks, advertising law, and intellectual property litigation. Her litigation experience involves representing clients in both state and federal court as well as international arbitration. She also advises clients on brand protection and enforcement matters, including trademark clearance, trademark selection, and trademark prosecution.  
  • Trademark and Advertising
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Ava R.M. Shelby
Associate
Los Angeles
Ava Shelby is an associate in the Los Angeles office of Wilson Sonsini Goodrich & Rosati, where she specializes in trademarks, advertising law, and intellectual property litigation.  Ava has worked extensively on matters involving trademark prosecution, brand protection and enforcement, trademark clearance and selection, licensing, copyright protection, advertising issues, domain name disputes, IP litigation, and arbitrations involving IP disputes. 
  • Litigation
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Kelly H. Yin
Associate
Century City
Kelly Yin focuses her practice on litigation and counseling over legal issues involving the internet, entertainment, and intellectual property.
  • Litigation
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Raj Mahapatra
Consultant
London
Raj Mahapatra is a consultant in the London office of Wilson Sonsini Goodrich & Rosati, where he brings to his practice three decades of varied career experience in a broad spectrum of sectors including PR, biotech, insurance, and nonprofit, with recent deep expertise in AI and clean tech. Raj primarily focuses on legal matters ranging from corporate governance and finance to intellectual property and policy.
  • Technology Transactions
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