Katherine Trefz

Williams & Connolly LLP

My Contact Information

Williams & Connolly LLP
Washington, DC, DC
Phone 1: 202-434-5038

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Washington DC


I represent companies and individuals facing a variety of investigations and prosecutions. I have represented individuals and companies in indicted matters, including as trial counsel, and guided companies and individuals through internal, civil, and criminal investigations.  My work primarily focuses on defending against allegations of corporate dishonesty and misconduct, including securities fraud, mail and wire fraud, antitrust crimes, the Foreign Corrupt Practices Act, and the False Claims Act. 

University of California, Berkeley School of Law, J.D., 2008, Order of the Coif

University of Southern California
, B.A., 2005, summa cum laude in Political Science, History; University Valedictorian

Law Clerk, Honorable Dean D. Pregerson, United States District Judge, Central District of California (2008-2009)

Practice Areas

  • Antitrust
  • Congressional Investigations
  • Corporate Crime
  • Government Investigations
  • Internal Investigations
  • SEC Enforcement
  • Trials
  • White Collar Crime