Mark R. Weinstein

Analyst Summary: Mark R. Weinstein
Date: 2026-05-09

Mark R. Weinstein is a partner in the Palo Alto office of Cooley LLP, where his practice focuses on patent litigation and other complex technology-related disputes. His work primarily involves defending large technology companies against patent infringement claims across a variety of sectors, including computer software and hardware, internet applications, e-commerce, and computer networking. The provided case list, which shows him exclusively representing defendants like Meta Platforms and Palo Alto Networks, aligns with his broader practice history of defending established operating companies.

Mr. Weinstein has a long track record of representing major Silicon Valley companies in high-stakes litigation. He has represented Facebook (now Meta) in more than a dozen patent infringement actions, including cases brought by Yahoo!, Leader Technologies, and numerous non-practicing entities. In addition to the tracked matters against Qomplx, Gaea, and Solos Technology, his representative cases include defending HTC and LinkedIn in various patent suits. His experience also extends to trade secret and copyright litigation, where he was part of a team that secured a unanimous defense verdict for Alstom ESCA in a six-week jury trial.

Beyond district court litigation, Mr. Weinstein has experience before the Patent Trial and Appeal Board (PTAB). He has been counsel in inter partes review (IPR) proceedings, such as representing Facebook in challenges to patents asserted against the company. For example, Cooley secured a PTAB victory for Facebook canceling claims in a patent asserted by EveryMD. More recently, he was part of a team that won a post-grant review for NeuroDerm, invalidating all claims of an AbbVie patent.

Mr. Weinstein earned his J.D. from the University of San Diego School of Law in 1997 and a B.S. from the University of California, San Diego, in 1992. He is an active member of the State Bar of California. Prior to joining Cooley, he was a partner at another international law firm where he served as managing partner of its Silicon Valley office, and he previously clerked for the Hon. Thomas J. Whelan of the U.S. District Court for the Southern District of California.