Jason A. Lief


Jason Lief is a premier patent trial lawyer with 25 years of experience. He has litigated and tried dozens of major patent and other intellectual property cases on behalf of some of the world’s most innovative and dynamic companies, often involving billion dollar products. Applying his legal and scientific training, Jason has established a reputation for winning outcomes and courtroom excellence. In-house counsel have said:

“Jason Lief is one of the most talented litigators I have ever had the privilege to work with in my 30 year career.”

Jim Harrington – Radius Health, Inc.

“Jason’s command of trial strategy and tactics is remarkable. … In the courtroom, Jason is masterful and is responsible for the most effective cross examination I have ever observed.”

David Banchik – Takeda Pharmaceuticals

Jason’s cases include major Hatch-Waxman pharmaceutical litigations (Zantac®, Wellbutrin®, Wellbutrin SR®, Wellbutrin XL®, Ceftin®, Intuniv®, Vyvanse®, Oxtellar XR®, Angiomax®, and Lialda®), as well as biotech, chemical, and consumer product patent cases.  Jason has also litigated trade secret, trademark, copyright, and IP contract disputes. He has argued before the U.S. Court of Appeals for the Federal Circuit and appeared in foreign courts pursuant to the Hague Convention. Jason has also successfully litigated in the inter partes review (IPR) arena.

Beyond litigation, Jason also counsels clients on various intellectual property issues.

Jason’s approach is to partner with clients to comprehensively understand the scientific, legal and business concerns they face. Listening to clients and asking the right questions is the key to winning. As Jason often says, “litigation is the art of the question.”

Jason’s matters have spanned a range of technologies and industries, including: pharmaceutics, pharmaceutical formulation, sustained-release formulations, pharmacokinetics, biotechnology, organic chemistry, polymers, antibodies, combinatorial chemistry, RNAi, DNA-sequencing technology, antibiotics, anti-depressants, anti-epileptic drugs, anti-retroviral AIDS drugs, ADHD medicines, gastrointestinal and anti-ulcer medicines, asthma medications, nanotechnology, injectables, peptide drug formulation, drug stabilization, advanced battery systems, detergents, dental rinses, deodorants, financial trade secrets and jewelry design.

Jason has been recognized as a New York Super Lawyer® for Intellectual Property Litigation from 2013 through 2019.


Cardozo School of Law
JD, 1995
magna cum laude
Law Review Editor

Brooklyn College
BA, 1987, Chemistry
magna cum laude
Phi Beta Kappa


New York State Bar
Supreme Court of the United States
U.S. Court of Appeals, Federal Circuit
U.S. District Court:
  Southern District of New York
  Eastern District of New York
  District of Colorado

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