Sean Twomey is a seasoned litigator with extensive experience representing a broad range of global Fortune 100 and 500 companies across various industries, including retail, health care, and defense. His experience includes serving as outside counsel to a leading global athletic footwear and apparel company, where he handled high-stakes litigation and provided strategic legal guidance on high-profile athlete endorsement contract negotiations.

Sean’s practice primarily focuses on complex commercial litigation, including breach of contract, business torts, and regulatory disputes. In addition, he routinely advises clients on matters involving general liability, complex torts, sports law, and health care compliance and enforcement, as well as appellate strategy. Sean’s diverse experience enables him to provide clients with a comprehensive legal approach that balances aggressive advocacy with practical business insight.

Areas of Focus

Litigation Defense
Sean has extensive experience in handling all aspects of civil litigation in federal and state courts. He is well-versed in managing internal investigations, compliance audits, False Claims Act qui tam litigation, and civil and criminal investigations related to defense export controls, as well as promotional, kickback, and safety issues involving FDA-regulated drugs and devices.

    Education

    • University of Virginia School of Law (J.D., 2011)
      • Order of the Coif
      • Executive Editor, Virginia Journal of Law and Social Policy
      • Pro Bono Service Award
      • Paul A. Simon Memorial Scholarship
    • University of California, Los Angeles (B.A. Philosophy, summa cum laude, 2007)

    Bar Admissions

    • California
    • New York
    • District of Columbia

    Court Admissions

    • U.S. Court of Appeals, Ninth Circuit
    • U.S. Court of Appeals, Federal Circuit
    • U.S. District Court, Central District of California
    • U.S. District Court, Northern District of California
    • U.S. District Court, Southern District of California

    Professional Affiliations

    • Law360 Sports Editorial Advisory Board, 2019-2020
    • Veterans Legal Institute, Former Board of Directors Member

    Awards & Honors

    Selected for inclusion in The Best Lawyers in America®: Ones to Watch in Entertainment and Sports Law, 2022

    Languages

    • Spanish

Sean Twomey

Sean Twomey is a seasoned litigator with extensive experience representing a broad range of global Fortune 100 and 500 companies across various industries, including retail, health care, and defense. His experience includes serving as outside counsel to a leading global athletic footwear and apparel company, where he handled high-stakes litigation and provided strategic legal guidance on high-profile athlete endorsement contract negotiations.

Sean’s practice primarily focuses on complex commercial litigation, including breach of contract, business torts, and regulatory disputes. In addition, he routinely advises clients on matters involving general liability, complex torts, sports law, and health care compliance and enforcement, as well as appellate strategy. Sean’s diverse experience enables him to provide clients with a comprehensive legal approach that balances aggressive advocacy with practical business insight.

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