Henry C. Thumann

Henry C. Thumann

O'Melveny & Myers

Recognized since 1989

Washington, District of Columbia

Practice Areas

Commercial Litigation

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Henry Thumann devotes his practice to high-stakes antitrust matters. He has spent a significant amount of time defending mergers and acquisitions before the U.S. antitrust agencies—the Federal Trade Commission (FTC) and the Department of Justice (DOJ)—for clients in an array of industries, including defense, healthcare, computer, supermarket, food products, gaming, and manufacturing.


  • 1625 Eye Street, NW
    Washington, DC 20006


  • Harvard University , LL.B., Magna Cum Laude, graduated 1960
  • University of Illinois - Chicago, B.S. , graduated 1957


  • Center For Public Resources Antitrust Committee - Member

O'Melveny & Myers
Headquarters: Los Angeles, California

78 The Best Lawyers in America® awards

9 Best Lawyers: Ones to Watch in America awards

Best Law Firms Badge Full Firm Profile

Recognized in The Best Lawyers in America® 2023 for work in:

  • Commercial Litigation

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