O’Melveny Worldwide

Henry C. Thumann

Of Counsel

Washington, DC Office
Areas of Focus
Areas of Focus
Antitrust & Competition
Aviation
Health Care
Litigation & Investigations
White Collar Defense & Government Investigations
Overview Insights News Credentials

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.

Admissions

Bar Admissions

  • California
  • District of Columbia

Education

  • Harvard Law School, LL.B., 1960: magna cum laude; Law Review, (1958-1960)
  • University of Illinois, B.S., 1957

Honors & Awards

  • Recognized by Best Lawyers in America® for Commercial Litigation in Washington, DC (1989-2026)
  • Recommended in litigation by the Euromoney Legal Media Group Expert Guides
  • Recommended in antitrust by Chambers USA

Professional Activities

Member

  • Ninth Circuit Judicial Council Committee on Evaluation of Judges and Lawyers (1985-2005)
  • Center For Public Resources Antitrust Committee (1986-present)
  • Ninth Circuit Judicial Conference (1982-85), (executive committee (1984 85))

Executive Committee, Antitrust Section, Los Angeles County Bar Association (1989-present) Chairman

  • Ninth Circuit Judicial Conference, lawyer representatives (1984-1985)
  • ABA Standing Committee on Aeronautical Law (1974-1977)

Los Angeles County Bar Association, 1986Fellow

  • American College of Trial Lawyers
Related Practices
Antitrust & Competition
Antitrust Counseling & Compliance
Litigation & Investigations
White Collar Defense & Government Investigations
Related Industries
Aviation
Health Care
Energy Transition
Power