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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.


Languages spoken: English, Chinese, Min Nan, Mandarin

Photos and videos

1215494 1258647172

Practice areas


  1. Intellectual Property: 34%
  2. Litigation: 33%
  3. Antitrust: 33%

Attorney endorsements

1 total 

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  • Christopher Muir Neumeyer

    David is very bright and competent in matters dealing with IP, litigation and international business. I recommend him without hesitation.


    Christopher Neumeyer Contracts and agreements Attorney
    Relationship: Fellow lawyer in community

Contact info

Perkins Coie LLP

Four Embarcadero Ctr, Suite 2400
San Francisco, CA, 94111


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Rising StarSuper Lawyers2010
Barrister of the YearSanta Clara County Bar Association2010
Rising StarSuper Lawyers2009
Rising StarMinority Bar Coalition2009
Outstanding Subcommittee ChairAmerican Bar Association, Litigation Section2009
Association namePosition nameDuration
Bar Association of San FranciscoBoard of Directors2010 - Present
American Bar AssociationSection of Litigation LGBT Litigators Committee Co-Chair2009 - Present
Bar Association of San Francisco Barristers ClubBoard of Directors2009 - Present
Minority Bar CoalitionCo-Chair2009 - Present
Santa Clara Law School Alumni AssociationBoard of Directors2009 - Present
Silicon Valley Intellectual Property Law AssociationTreasurer2009 - Present
Bay Area Lawyers for Individual FreedomTreasurer2007 - Present
Ingram Inn of CourtMember2007 - Present
AIDS Legal Referral PanelBoard of Directors2007 - Present
Asian American Bar Association of the Greater Bay AreaMember2003 - Present
Asian Pacific American Bar Association (Silicon Valley)Member2003 - Present
School nameMajorDegreeGraduated
Stanford UniversityBiological SciencesMS - Master of ScienceN/A
Santa Clara University School of LawLawJD - Juris DoctorN/A
Harvard CollegeBiochemcial SciencesA.B.N/A