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  • J.D., Columbia University, 2005, Harlan Fiske Stone Scholar, Executive Editor, Columbia Journal of Environmental Law, Board Member, Columbia Environmental Law Society
  • B.A., University of California, Los Angeles, 2002
  • California
  • U.S. Court of Appeals for the Ninth Circuit
  • U.S. District Court for the Central District of California
  • U.S. District Court for the Eastern District of California
  • U.S. District Court for the Northern District of California
Publications & News

Leo Caseria is a partner in the Antitrust & Trade Regulation practice group in the Los Angeles office of Sheppard Mullin. 

Areas of Practice

Mr. Caseria's practice focuses on antitrust law and complex commercial litigation, in both state and federal courts. He has represented global companies in connection with a wide variety of antitrust matters, including matters involving alleged exclusionary conduct, price-fixing, and international cartels, as well as matters involving the intersection of antitrust and intellectual property. He has frequently defended companies in class actions and multidistrict litigation. He is also knowledgeable regarding the enforceability of class action waivers, and has authored articles and counseled on the inclusion of class action waivers in arbitration agreements. Mr. Caseria has also represented companies in connection with antitrust investigations by the United States Department of Justice. He has represented clients including Samsung, Philip Morris and Live Nation in connection with major antitrust matters.

Mr. Caseria is active in the American Bar Association's Section of Antitrust Law. He was appointed Vice Chair of the Section’s Books and Treatises Committee for the 2013-2014 ABA year. Mr. Caseria has contributed to Section publications and newsletters, and has also authored articles for SCOTUSblog and the New York Law Journal.

Representative Engagements

  • Representing Diamond Electric in international price-fixing investigation in the automotive sector.
  • Representing Samsung Electronics in global patent and standards related antitrust governmental proceedings.
  • Representing Samsung SDI against price-fixing claims involving cathode ray tubes (CRT). In re Cathode Ray Tube (CRT) Antitrust Litig., MDL. No. 1917 (N.D. Cal.)
  • Representing Samsung SDI against price-fixing claims involving thin film transistor liquid crystal display products. In re TFT-LCD (FLAT PANEL) Antitrust Litigation, MDL. No 1827 (N.D. Cal.)
  • Represented Samsung Electronics against multi-billion dollar group boycott claim brought by Rambus under California’s Cartwright Act concerning a certain type of DRAM. Rambus Inc. v. Micron Technology Inc., 04-0431105 (San Francisco Superior Court)
  • Represented Samsung against federal and state antitrust claims brought by direct and indirect purchasers of SRAM alleging horizontal conspiracy to exchange information for the purpose of fixing prices. In re SRAM Antitrust Litigation, MDL No. 1819 (N.D. Cal.)
  • Represented Live Nation and Clear Channel against Sherman Act § 2 monopolization claims brought by a purported class of purchasers of rock concert tickets. In re Live Concert Antitrust Litigation, MDL No. 1745 (C.D. Cal.)
  • Represented Philip Morris against Sherman Act § 1 challenge to the $246 billion dollar Master Settlement Agreement between leading tobacco companies and 46 states. Contributed to successful U.S. Supreme Court brief in opposition to petition for certiorari following favorable ruling by the Ninth Circuit Court of Appeals in Sanders v. Brown, 540 F.3d 903 (9th Cir. 2007).


Antitrust Law Blog Posts

Other Publications

  • Contributor, ABA Section of Antitrust Law, Joint Conduct Committee E-Bulletin, Spring 2013
  • Contributor, ABA Section of Antitrust Law, 2012 Annual Review of Antitrust Law Developments, 2013
  • State Bar of California, Antitrust and Unfair Competition Law Section
  • Vice-Chair, Books and Treatises Committee of the ABA Section of Antitrust Law