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Advocacy at a Higher Level

Horvitz & Levy is a solutions-based firm focused on appellate success. We are distinguished by our commitment to responsive service and on-going innovation in the areas of civil appellate litigation, amicus curiae support, and trial strategy consultation.

Our firm history, honors and awards, and locations speak to our collaborative approach and commitment to serving clients as well as the outstanding legal resources we bring to bear.

Yen-Shyang  Tseng

Yen-Shyang Tseng

Associate - Los Angeles Office

How Yen Helps Clients

Yen-Shyang Tseng has appellate and trial court experience in complex litigation matters involving patent law, trade secrets, partnership, shareholder disputes, products liability, insurance bad faith, and professional liability and ethics matters, including attorney disqualification. Yen has represented clients in the California Supreme Court, the California Court of Appeal, the U.S. Court of Appeals for the Ninth Circuit, and in state and federal trial courts.

Before joining Horvitz & Levy, Yen was an associate at the trial boutique Keller/Anderle LLP.  Yen previously served as a law clerk to the Honorable Joseph R. Goodwin of the U.S. District Court for the Southern District of West Virginia.

Yen graduated magna cum laude from Washington University School of Law, where he was elected to the Order of the Coif.  He also served on the editorial board of the Washington University Journal of Law and Policy.  Yen obtained his undergraduate degree in Economics, with highest honors, from Georgia Tech.


  • Washington University School of Law
    J.D., magna cum laude, 2011
  • Georgia Institute of Technology
    B.S., summa cum laude, 2008


  • Hon. Joseph R. Goodwin, U.S. District Court, Southern District of West Virginia (2012-2013)

Bar Admissions

  • California
  • U.S. Supreme Court
  • U.S. Court of Appeals, Ninth Circuit
  • U.S. District Court, Central District of California
  • U.S. District Court, Eastern District of California
  • U.S. District Court, Northern District of California
  • U.S. District Court, Southern District of California

Professional Associations

  • Los Angeles County Bar Association, Appellate Courts Section, Entertainment Law and Intellectual Property Section, Executive Committee; State Appellate Judicial Evaluations Committee (2017-present); Amicus Briefs Committee (2017-present)



  • My First Appellate Argument (2017) Cal. Litig., Vol. 30, No. 1.
  • Willful Patent Infringement and Enhanced Damages After Halo Electronics Inc. v. Pulse Electronics, Inc. (2016) Orange County Law.
  • Companies Can Get Hammered for Willful Patent Infringement, Say Supremes (July 18-24, 2016) Orange County Bus. J.
  • Governing Virtual Worlds:  Interration 2.0 (2011) 35 Wash. U. J. L. & Po’ly 547.