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David Jeanchung Tsai

About David Tsai

About me

David J. Tsai is an associate in Perkins Coie's San Francisco office and a member of the Litigation Practice Group. Mr. Tsai’s practice focuses on trade secret and patent litigation, with an emphasis on pharmaceuticals (Hatch-Waxman Act/ANDA), biotechnologies, the Internet, software, semiconductors, and medical devices. His legal experience also includes litigating in the areas of copyrights and trademarks, preparing and prosecuting U.S. electrical engineering patent applications, drafting patentability, freedom-to-operate and non-infringement opinions, as well as dealing with patent interference in the area of biotechnology. Mr. Tsai has written on Hatch-Waxman related issues and Internet software applications.


During law school, Mr. Tsai served as an extern to the Honorable Howard R. Lloyd of the United States District Court for the Northern District of California and a law clerk for the Law Foundation of Silicon Valley (AIDS Legal Services).


Prior to his legal career, Mr. Tsai worked in product management at Internet/software startups Zaplet, Inc., and funded by Kleiner Perkins and the Mayfield Fund, respectively. He focused on developing platforms for collaborative communications.


Mr. Tsai also previously led the U.S. product management team for Corbett's Rotor-Gene (real-time PCR) product line. In addition, he  has authored numerous articles for scientific publications (Proceedings of the National Academy of Sciences, The Journal of Comparative Neurology, Experimental Neurology, and Society of Neuroscience Abstracts) related to his undergraduate honors thesis and graduate research at Harvard Medical School and Stanford University on stem cell and viral gene therapy tools for the treatment of neurological diseases and cancer.


Mr. Tsai currently serves on five boards, including the Board of Directors of the Bar Association of San Francisco and the Silicon Valley Intellectual Property Law Association, and was named Barrister of the Year by the Santa Clara County Bar Association in 2010 and a “Rising Star” in intellectual property litigation by Super Lawyers in 2009 and 2010.


Mr. Tsai is committed to serving pro bono clients on behalf of the firm. He has represented pro bono clients at settlement conferences through the Northern District Court Assisted Settlement Conference Program. Mr. Tsai has also worked on civil rights and immigration pro bono matters with the Lawyers Committee for Civil Rights and the Asian Law Caucus. He is the recipient of the Minority Bar Coalition’s Rising Star Award and the ABA Section of Litigation’s Outstanding Subcommittee Chair Award.


Mr. Tsai is fluent in spoken Taiwanese and Chinese Mandarin.

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