Mark Liang


Thank you for your interest. Before you communicate with one of our attorneys, please note: Any comments our attorneys share with you are general information and not legal advice. No attorney-client relationship will exist between you or your business and O’Melveny or any of its attorneys unless conflicts have been cleared, our management has given its approval, and an engagement letter has been signed. Meanwhile, you agree: we have no duty to advise you or provide you with legal assistance; you will not divulge any confidences or send any confidential or sensitive information to our attorneys (we are not in a position to keep it confidential and might be required to convey it to our clients); and, you may not use this contact to attempt to disqualify O’Melveny from representing other clients adverse to you or your business. By clicking "accept" you acknowledge receipt and agree to all of the terms of this paragraph and our Disclaimer.


Mark Liang focuses his legal practice on patent and technology-related litigation. He has experience in all stages of patent cases, including claim construction, fact and expert discovery, dispositive motions, trial preparation, post-trial, and appeal. He represents clients in federal courts and before the International Trade Commission and United States Patent and Trademark Office, including reexaminations and inter partes review (IPR). Mark has a background in electrical engineering, and has experience and knowledge of telecommunications, signal processing, multimedia, computer graphics, computer hardware, electronics, internet technologies, and semiconductor fabrication.

Mark regularly handles large and challenging patent cases, including several that have gone to trial and appeal. He also handles trade secret cases and advises on software copyright and technology standards matters, including F/RAND damages and obligations to standards setting organizations. He represents a variety of businesses in the technology sector, including Internet, consumer electronics, mobile devices, telecommunications providers, and telecommunications equipment manufacturers.


Bar Admissions

  • California
  • Illinois

Court Admissions

  • US District Court, Northern, Central, and Southern Districts of California
  • US Federal Circuit Court of Appeal

Registered to Practice

  • US Patent and Trademark Office (limited recognition)


  • University of Chicago, J.D.: with honors; John M. Olin Fellowship in Law and Economics; Executive Editor, The Chicago Journal of International Law
  • University of Toronto, B.A.Sc., Electrical Engineering: with high distinction

Professional Activities


  • Seventh Circuit Court of Appeals 


  • Bar Association of San Francisco 


  • “Fee Shifting in Patent Litigation,” (co-author Brian Berliner), Virginia Journal of Law & Technology, Vol.18, No.01 (Fall 2013)
  • “Chinese Patent Quality:  Running the Numbers and Possible Remedies,” 11 J. Marshall Rev. Intell. Prop. L. 478 (2012)
  • “The Aftermath of TS Tech:  The End of Forum Shopping in Patent Litigation and Implications for Non-Practicing,” 19 Texas Intell. Prop. L. J. 29 (2010)
  • “Stopping Intellectual Property Infringement in China:  A Three-Pronged Approach,” 11 Chi. J. Int’l. L. 285 (2010)
  • “Green Taxes and the WTO: Creating Certainty for the Future,” 10 Chi. J. Int’l. L. 359 (2009)


  • “Quality of Chinese Patents,” Review of Intellectual Property Law Symposium (Chicago, April 2012)
  • “Popular Districts for Patent Cases,” Berkeley Law Series (Berkeley, February 2012)  
  • Defending a consumer electronics company across seven actions and IPR proceedings covering twenty-three patents relating primarily to semiconductor fabrication. (E.D. Tex., D. Del., D.N.J., USITC; USPTO)
  • Defending as trial and post-trial counsel an Internet software company in a patent case relating to computer and Internet security software. (E.D. Tex.)
  • Defended as trial and post-trial counsel an Internet software company in a patent case relating to mapping technologies. (D. Del.; Fed. Cir.)
  • Defended a consumer electronics company in a nine-patent case relating to computer hardware and graphics processor technologies used in mobile devices. (E.D. Tex.)
  • Defended an Internet and television provider against a patent licensing fund in a 19-patent case relating to digital subscriber line (DSL) technology. (W.D. Tex.)