Brian Michael Weissenberg is an associate in the Washington, D.C. office of Latham & Watkins.

Mr. Weissenberg represents clients in matters relating to IP litigation, with an emphasis on patent and trade secrets litigation. His experience includes representing clients litigating a range of technologies, from semiconductors, lithium-ion battery separators, DNA sequencing, air-cooled condensers, and advertising algorithms. Mr. Weissenberg has experience in various stages of litigation, including taking and defending fact and expert witness depositions, preparing expert reports, drafting and arguing motions, and participating in trials.

Prior to joining Latham, Mr. Weissenberg worked in the Los Angeles office of another law firm. Mr. Weissenberg clerked for Judge Kimberly Moore of the US Court of Appeals for the Federal Circuit and for Judge Janis Sammartino of the US District Court for the Southern District of California.

During law school, Mr. Weissenberg served as a senior editor for the Stanford Law Review. He earned his bachelor’s degree in political science and religious studies from the University of California, Berkeley, where he was a member of the Phi Beta Kappa Honor Society. He was also the recipient of the Political Science Department Citation, which allowed him to deliver the Political Science graduation commencement speech.

Mr. Weissenberg’s experience includes representing:

  • Celgard, LLC v. Shenzhen Senior Technology Material Co. Ltd. (US) – Representing Shenzhen Senior and other Defendants in multi-patent and trade secret lawsuit involving lithium ion battery separator technology in the US District Court for the Northern District of California.
  • System1 Research Ltd. v. System1 LLC – Representing System1 LLC in trademark lawsuit involving advertising algorithm technology in the US District Court for the Southern District of New York.
  • Peloton Interactive, Inc. v. Echelon Fitness Multimedia, LLC Representing Peloton in lawsuit involving exercise technology in the US Court of Appeals for the Federal Circuit.
  • VLSI Technology LLC v. Intel Corporation – Represented VLSI Technology LLC in multi-patent lawsuit involving semiconductor technology in the US District Court for the District of Delaware and the US District Court for the Western District of Texas, resulting in a trial verdict of over US$2.1 billion against Intel in one of the Texas trials.*
  • Personal Genomics Taiwan, Inc. v. Pacific Biosciences of California, Inc. – Represented Personal Genomics Taiwan, Inc., a developer of single-molecule sequencing technologies, in a patent litigation filed in the US District Court for the District of Delaware.*

*Matter handled prior to joining Latham

Bar Qualification

  • California
  • District of Columbia


  • JD, Stanford Law School, 2016
  • BA in Political Science & Religious Studies, University of California, Berkeley, 2011
    Highest Distinction