Kelse Moen


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Kelse Moen is a counsel in the firm’s Antitrust and Competition Practice Group, where he represents clients in a broad range of commercial, civil, and criminal matters. He is an experienced litigator who has assisted clients at every stage of litigation, including briefing dispositive motions in federal court, deposing adverse parties and expert witnesses, and engaging in oral argument before a judge.

Prior to joining O’Melveny, Kelse worked as an associate in the antitrust group of a major law firm in Washington, DC. Before that, he served as a law clerk to Judge Robert D. Mariani of the United States District Court for the Middle District of Pennsylvania.


Bar Admissions

  • District of Columbia
  • Massachusetts


  • Cornell University, J.D.
  • Emory University, B.A., Philosophy/Political Science

Professional Activities


  • Honorable Robert D. Mariani, US District Court, Middle District of Pennsylvania


  • “Differing Proof Requirements for Global Class Actions: Using Economic Analysis to Guide Future Policymakers” (co-authors Nicholas Powers and John Roberti), Antitrust Magazine (August 30, 2021, Volume 35, Issue 3) (nominated for 2022 Concurrences Antitrust Writing Awards in Business Articles & Private Enforcement)
  • “Monopsony Power and COVID-19: Should We Exempt Monopsonists to Deal with the Crisis?” (co-author John Roberti), Competition Policy International Antitrust Chronicle  (June 12, 2020), available at
  • “The Role and Relevance of Exemption and Immunities in U.S. Antitrust Laws,” (co-authors John Roberti and Jana Steenholdt), presented at the United States Department of Justice Roundtable on Exemptions and Immunities from Antitrust Law (March 14, 2018), available at 


  • Panelist, “Recent Developments in Antitrust Law,” Western Alliance Bank Class Action Law Forum Virtual Conference with University of San Diego School of Law (April 21, 2021)