Alyssa B. Monsen

Alyssa B. Monsen

Of Counsel
PHONE: 212-808-2976 FAX: 212-351-3401
Alyssa Monsen’s practice focuses on life-sciences patent litigation in federal district and appellate court and in inter partes review proceedings before the Patent Trial and Appeal Board.  Alyssa has represented innovator pharmaceutical companies in high stakes litigations, including cases involving oncology, ophthalmology, and infectious disease therapies.

Alyssa has experience with all aspects of patent litigation from pre-litigation strategic planning through trial and Federal Circuit appeal.  Alyssa also has experience counseling clients in patent portfolio assessment, due diligence, and international patent enforcement strategy.

In 2017, Alyssa was recognized as a New York “Rising Star” in Intellectual Property Litigation by Super Lawyers magazine.

Prior to practicing law, Alyssa was a strategy consultant for pharmaceutical companies at Computer Sciences Corporation.  She also has experience working with a market research firm catering to hedge fund and institutional investors covering pharmaceutical, biotech, medical device and dental markets.

Prior Experience

  • Associate, Fitzpatrick Cella Harper & Scinto, New York, NY, 2011-2014
  • Associate, Sidley Austin LLP, New York, NY, 2014-2019

Clerk & Government Experience

  • Summer Legal Intern, Health and Human Services, Departmental Appeals Board, 2009


  • US District Court, Southern District of New York
  • US District Court, Eastern District of New York
  • US Court of Appeals, Federal Circuit


Representative Matters

  • Served as trial and appeal counsel for Johnson & Johnson subsidiary Janssen Pharmaceuticals in patent infringement suits filed under the Hatch-Waxman Act and inter partes review proceedings involving blockbuster prostate cancer drug, Zytiga®
  • Served as litigation counsel for Genetech, Gilead, and Hoffman-La Roche in a patent infringement suit filed under the Hatch-Waxman Act involving blockbuster influenza drug, Tamiflu®
  • Served as trial and appeal counsel for Plaintiffs in patent infringement suits filed under the Hatch-Waxman Act involving topical ophthalmic antibiotic, AzaSite®


  • Contributing author, Regeneration of the infarcted heart with stem cells derived by nuclear transplantation, Circulation Research, April 2, 2004, 820-7
  • Contributing author, Cardiac stem cell and myocyte aging, heart failure, and insulin-like growth factor-1 overexpression, Circulation Research, March 5, 2004, 514-24


Georgetown University Law Center, J.D, 2011; Dean’ List 2008-2009; CALI Award for Tort Law; Student Intellectual Property Law Association, Secretary

Princeton University, B.A., Molecular Biology, 2005


2013, New York



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Phone: 212-351-3400


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