Elizabeth S. Weiswasser


Elizabeth Weiswasser

Elizabeth (“Liz”) Stotland Weiswasser is a partner in Weil’s Patent Litigation practice group in the Firm’s New York office with more than twenty years of experience handling patent and other intellectual property matters on behalf of some of the most sophisticated companies in the pharmaceutical, biotechnology, chemical, and medical device sectors. Throughout her career, she has been and continues to be a leader and widely-respected colleague and mentor on her teams at Weil, in her community, and in the legal and academic fields more broadly.

Ms. Weiswasser is known across the industry as a leading light in the field of life sciences and patent litigation, and particularly as one of the top women in her field. Her many accolades, driven by market and client-specific feedback, include:

  • Chambers USA:  Since 2011, Ms. Weiswasser has been recognized as a leading lawyer for patent litigation by Chambers USA, which over the years has reported on client and peer feedback of Ms. Weiswasser:
    • Ms. Weiswasser “impresses clients with her ‘command of the subject matter’ coupled with ‘outstanding communication skills.’ Her ‘top-notch client service’ is also praised, with sources describing her as ‘a delightful person to work with.’”
    • Ms. Weiswasser is “an accomplished trial lawyer” and “a firm but calm voice who garners nothing but respect from the people around her.”
    • Ms. Weiswasser “is able to manage the big picture and handle the small details simultaneously” and “continues to impress with her superb work as a patent litigator concentrating on biologics and pharmaceuticals.”
    • Ms. Weiswasser “inspires confidence and is praised for her ‘strong background in molecular biology and the life sciences, which allows her to communicate effectively with scientists and medical professionals and explain scientific concepts to non-scientists.’”
  • LMG Life Sciences: In 2017, LMG named her the winner of its “New York General Patent Litigator of the Year” award, after short-listing her for that award in 2016. LMG also has named her a Life Sciences “Star” every year since 2014.
  • IAM Patent 1000: Ms. Weiswasser has been recommended for patent litigation in New York every year since 2012 by IAM Patent 1000. In 2017, the publication called her “a life sciences doyenne who combines a sparkling intellect with legal creativity and commerciality.” The 2016 edition described Ms. Weiswasser as “one of the brightest and most sophisticated IP litigators you could have the pleasure of dealing with,” and reported: “When the stakes are high, she navigates impressively, using her intellectual prowess and ability to gain trust and confidence. She has something which you can’t teach – an instinct for balancing the legal and commercial issues pertinent to a case.” IAM further reports that “peers admire her for crafting ‘attention-grabbing and creative arguments.’” IAM also specifically notes her “strong technical background in the life sciences, which she combines with a top-line understanding of patent law.”
  • Managing Intellectual Property Top Women in IP:  Ms. Weiswasser has been named one of the global “Top 250 Women in IP” by Managing Intellectual Property and included in the publication’s list of “IP Stars” every year since 2013.
  • Legal 500:  Ms. Weiswasser has been identified by Legal 500 US every year since 2013 for her work in life sciences.
  • Super Lawyers Top Women for IP:  Ms. Weiswasser has been repeatedly named among the “Top Women” for Intellectual Property in New York by Super Lawyers.

Ms. Weiswasser has extensive experience and training in biochemistry and molecular and cell biology and marries that technical expertise with her skill and experience as a patent litigator and counselor – both before federal courts and the U.S. Patent and Trademark Office (USPTO, where she is licensed to practice), including in inter partes review and reexamination proceedings. She is also a sought-after counselor on strategic issues impacting intellectual property and life cycle management matters.

Ms. Weiswasser has represented major pharmaceutical, biotechnology, and medical device companies in a wide variety of patent and technology disputes in all of the major patent litigation venues throughout the country. She regularly handles patent cases for innovator pharmaceutical companies under the Hatch-Waxman Act, as well as competitor patent disputes across the biopharma, chemical, and medical device industries. Ms. Weiswasser has extensive litigation experience across the full range of biopharma technologies, including small molecules, formulation, drug delivery, and biologics. Ms. Weiswasser is lead counsel in nearly two dozen IPR proceedings. Ms. Weiswasser has also handled the IP-related aspects of some of the most sophisticated and important transactions in the life sciences sector.

In addition to her practice, Ms. Weiswasser served as an Adjunct Professor of Law at New York University Law School, where she taught Biotechnology/Life Sciences Patent Law for seven years, and she is also a frequent lecturer and writer on intellectual property issues in the life sciences industry. She also is a leader in public service and in her community. She has been honored for her pro bono work by the Legal Aid Society and Westchester Residential Opportunities, for which her team received the Harriett Goldberg Fair Housing Award. She has served on the boards of Montclair Kimberley Academy, where her daughters attend/attended school, and The Epilepsy Foundation. She presently serves on the Dean’s Visiting Committee of The University of Chicago Law School.

From 1992 to 1994, Ms. Weiswasser served as law clerk to the Honorable Alan D. Lourie, Circuit Judge of the United States Court of Appeals for the Federal Circuit. Ms. Weiswasser received her JD degree from The University of Chicago Law School, where she was a member of The Law Review, and her BA from Northwestern University in biochemistry, molecular biology and cell biology. Prior to entering law school, she did graduate work at Princeton University in molecular biology.

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