Image: Ashley N. Mays-Williams

Ashley N. Mays-Williams

Partner, Litigation Department

New York

Phone: 1(212) 318-6816
Fax: 1(212) 230-7816


Ashley Mays-Williams, Ph.D. is a partner in the Litigation practice of Paul Hastings and is based in the firm’s New York office. Her practice primarily focuses on intellectual property law, particularly patent litigation matters in the fields of pharmaceuticals and biotechnology.

Dr. Mays-Williams has experience litigating cases arising under the Hatch-Waxman Act on behalf of innovator companies. She has represented life science companies in litigations involving pharmaceutical compounds, pharmaceutical formulations, and antibody technology. Dr. Mays-Williams has also represented and counseled clients in numerous other technology areas including medical devices, bone pastes and cements, and batteries.

Dr. Mays-Williams received her J.D. from William Mitchell College of Law, cum laude, in 2012 where she served as a member of the intellectual property law review journal Cybaris®

She obtained her Ph.D. from King’s College London in Medical and Molecular Genetics in 2010, and graduated with a B.S. in Molecular Biology from University of Wisconsin in 2003. Prior to joining Paul Hastings, Dr. Mays-Williams was a patent prosecutor at a boutique prosecution shop located in the Midwest.


Recent representative matters include:

  • Daiichi Sankyo in a hotly-contested, multi-billion dollar breach of contract intellectual property biotechnology dispute involving antibody-drug conjugates (“ADCs”) for the treatment of various cancers
  • Eisai Inc. in a patent infringement case involving Targretin® (bexarotene), an oral treatment for cutaneous T-cell lymphoma
  • Teijin Pharma Limited in a patent infringement case involving Uloric® (febuxostat), an oral treatment to lower blood uric acid levels
  • Eli Lilly & Co. in litigation with Sanofi regarding Eli Lilly’s request to market its insulin glargine drug product Basaglar®
  • Amgen Inc. in a breach of contract and business tort suit brought in the Delaware Chancery Court arising out of Amgen’s development/joint venture agreements relating to Prolia® and Xgeva®

    Practice Areas


    Patent Litigation

    Intellectual Property

    Life Sciences and Healthcare

    ESG & Impact

    ESG & Sustainable Finance

    Impact Investing

    Global Dispute Resolution Practice for Japanese Clients

    International Arbitration




    New York Bar

    United States Patent & Trademark Office


    William Mitchell College of Law, J.D. 2012

    King's College London, Ph.D. 2009

    University of Wisconsin-Madison, B.S. 2003

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