O’Melveny Worldwide

Jason Yan focuses his practice on healthcare, antitrust litigation, and counseling clients on competition issues. He has a wide range of experience across various industries, including airlines, agriculture, telecommunications, consumer electronics, data aggregation, financial services, semiconductors, healthcare, and transportation services.


Jason is an experienced and well-rounded litigator. He has briefed motions in federal district court at every stage of litigation; worked extensively to prepare the depositions of fact and expert witnesses; and briefed and argued cases in support of clients in state court.

Most recently, Jason was one of the core members of the trial team that defended AT&T and Time Warner in the “antitrust trial of the century,” defeating an attempt by the Department of Justice to block the $85 billion merger that has forever changed the landscape of the telecom and media industry. Jason is also a trusted advisor outside the courtroom, offering guidance to clients throughout the course of conducting internal investigations, responding to government requests, and engaging in informal advocacy before government agencies in connection with a number of confidential and/or otherwise sensitive matters.


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  • Defended $85 billion AT&T-Time Warner merger against challenge by US Department of Justice. United States v. AT&T Inc., 310 F. Supp. 3d 161 (D.D.C. 2018).
  • Obtained favorable settlement for Honeywell International Inc. in private litigation alleging violations of Section 2 of the Clayton Act in connection with the manufacture and sale of electronic fire and security products. AlarMax Distributors, Inc. v. Honeywell International, Inc., 2:14-cv-01527 (W.D. Penn. 2014).
  • Obtained favorable settlement for Humana Inc. in bellwether False Claims Act qui tam suit alleging reverse false claims and submission of false diagnosis data supplied by Florida-based physician’s office. U.S. ex rel. Graves v. Plaza Medical Centers, Corp. & Humana Inc., 1:10-cv-23382 (S.D. Fla 2012).
  • Prepared written comments and expert support on behalf of multiple Medicare Advantage Organizations in connection with public notice-and-comment on the Centers for Medicare and Medicaid Services proposed RADV audit methodology.
  • Advised clients in a wide range of industries in connection with confidential internal investigations and responding to government requests for information.
  • Successfully argued on appeal for vacation of contempt sanctions against pro bono client in a rare published opinion issued by the Maryland Court of Special Appeals. Kowalczyk v. Bresler, 231 Md. App. 203, 149 A.3d 1247 (2016).


Bar Admissions

  • District of Columbia
  • Virginia


  • Georgetown University Law Center, J.D., Cum Laude; Editor, American Criminal Law Review
  • Duke University, B.S.

Professional Activities


  • “The Symbiosis of Banks and Marketplace Lending: Where Are We and Where Are We Headed?” Banking Law Journal 133 Banking L.J. 322 (June 2016), co-authored with Bimal Patel (Assistant Secretary of the U.S. Treasury) and Jeremiah Norton (former Board Member of the Federal Deposit Insurance Corporation)