John Holler

John Holler

Senior Associate

John Holler's practice focuses on helping clients navigate complex antitrust issues. Mr. Holler represents clients across a range of industries in government merger and conduct investigations and in civil antitrust litigation. Prior to joining Arnold & Porter, Mr. Holler worked as a trial attorney at the Antitrust Division of the US Department of Justice. While at DOJ, Mr. Holler played a key role in nearly a dozen civil antitrust investigations and two merger litigations (Anthem-Cigna and Sabre-Farelogix).

Mr. Holler maintains an active pro bono practice, focused on representing clients in immigration-related proceedings.

Mr. Holler is a graduate of The University of Chicago Law School and Pomona College. While in law school, Mr. Holler interned at DOJ Antitrust's Chicago office. Between college and law school, Mr. Holler worked as an honors paralegal in the Federal Trade Commission's Bureau of Competition, working on antitrust matters and for the Director of the Bureau of Competition.


  • US Department of Justice, Attorney General’s Award for Distinguished Service (2019)
  • US Department of Justice, Antitrust Division, Award of Distinction (2017, 2018)


  • J.D., with honors, University of Chicago Law School, 2016
  • B.A., cum laude, International Relations, Pomona College, 2011
  • New York
  • Illinois
  • U.S. District Court, Southern District of New York
Government & Military Service
  • Trial Attorney, US Department of Justice, Antitrust Division (2016–2020)
  • Honors Paralegal, Federal Trade Commission, Bureau of Competition (2011–2013)

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