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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 & Competition Practice Group in the Los Angeles office of Sheppard Mullin. 

Areas of Practice

Mr. Caseria’s practice focuses on antitrust and competition matters.  He has advised companies on mergers and acquisitions, successfully litigated competition disputes, and represented clients involved in government antitrust investigations.  He has also advised companies on competition issues relating to intellectual property, standard-setting, and FRAND licensing.  Many of the matters Mr. Caseria has worked on are international in scope, and his experience covers a broad spectrum of industries, including consumer electronics, automotive parts and cement and concrete.  

Mr. Caseria has litigated many cases involving alleged antitrust violations under the Sherman and Clayton Acts, including price-fixing, boycott, and monopolization cases.  He frequently defends companies in a class action or multidistrict litigation context and has authored articles and counseled on the inclusion of class action waivers in arbitration agreements.  His litigation experience also includes disputes involving unfair competition, tortious interference and trade secrets.  

Mr. Caseria has also represented clients involved in DOJ or FTC antitrust investigations.  His experience includes both civil and criminal government antitrust investigations.  He has also helped companies obtain antitrust clearance on mergers and acquisitions, and counsels clients on the requirements under the Hart-Scott-Rodino Act. 

Mr. Caseria is active in the American Bar Association's Section of Antitrust Law, where he is currently Vice Chair of the Section’s Books and Treatises Committee. Mr. Caseria has contributed to Section handbooks, newsletters, and other publications, and has also authored articles for SCOTUSblog and the New York Law Journal.

  • Antitrust, Legal 500, 2015

Representative Engagements

  • 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 actions brought by Attorneys General of Illinois and Oregon. 
  • Representing Samsung Electronics in global patent and standards related antitrust governmental proceedings and private actions.
  • Represented Samsung SDI against multi-billion dollar price-fixing claim brought by Motorola. Claims dismissed just before trial. Motorola Mobility LLC v. AU Optronics Corporation, 09-cv-6610 (N.D. Ill.)
  • Represented 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 Diamond Electric in international price-fixing investigation in the automotive sector.
  • 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

  • Editor, ABA Section of Antitrust Law, Antitrust Evidence Handbook, Third Edition, 2016
  • Editor, ABA Section of Antitrust Law, Handbook on the Scope of Antitrust, 2015
  • Editor, ABA Section of Antitrust Law, Handbook on Sports and Antitrust Law, 2014
  • 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
  • Senior Editor, ABA Section of Antitrust Law, Handbook on Multijurisdictional Competition Law Investigations, 2010
  • State Bar of California, Antitrust and Unfair Competition Law Section
  • Vice-Chair, Books and Treatises Committee of the ABA Section of Antitrust Law