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William O’Neil

Of Counsel

New York +1 212 841 1103

  • About
  • Representative Matters
  • Credentials
  • About

    Bill O’Neil is a litigator whose practice focuses on high-stakes commercial and class action litigation, with significant experience in financial services and ERISA disputes. He represents corporations and individuals across a range of industries, including financial services, defense contracting, biopharmaceuticals, and media and entertainment.

    Bill has experience in all stages of the litigation process, including case strategy, pleadings, dispositive motions, and trial preparation. He has been a member of multiple trial teams, including the trial of an ERISA class action, and routinely prepares fact and expert witnesses, drafts opening and closing statements, and conducts direct and cross examinations. In each engagement, Bill prioritizes a deep understanding of his clients’ businesses to advance their commercial objectives and secure favorable outcomes.

    Areas of Expertise

  • Practices and Industries
  • Representative Matters
    • Represented a major credit reporting agency in an enforcement action brought by a government regulator. The matter was resolved after discovery, when the regulator voluntarily dismissed all claims.
    • Defended a major defense contractor in an ERISA class action involving pension benefits. Secured judgment in the client’s favor on all claims following a one-week bench trial.
    • Representing a major defense contractor in a putative ERISA class action challenging the actuarial assumptions used to calculate optional pension benefits.
    • Serving as defense counsel in multiple ERISA class actions challenging plan administrators’ allocation of forfeitures.
    • Representing the operator of multiple healthcare facilities in action lawsuits challenging out-of-network reimbursement rates for emergency medical services.




    Areas of Expertise

  • Credentials
    Education
    • Harvard Law School, J.D., 2013
        • cum laude
    • Brown University, B.A., 2010
        • magna cum laude
        • Phi Beta Kappa
    Bar Admissions
    • New York
    Judicial Clerkship
    • Hon. Diana Gribbon Motz, U.S. Court of Appeals, Fourth Circuit, 2013 - 2014
    Pro Bono
    • Successfully represented plaintiff in Americans with Disabilities Act action challenging municipality’s failure to provide adequate handicapped parking in town’s commercial district.
    • Successfully represented individual in administrative proceeding challenging transit authority’s denial of paratransit benefits.
    • Successfully represented juvenile seeking Special Immigrant Juvenile Status under the Immigration and Nationality Act.

    Areas of Expertise

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