Catherine Thompson

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Catherine H. Thompson’s practice focuses on advising and counseling clients through investigations by federal and state enforcement authorities, conducting complex and sensitive internal investigations, and litigating complex civil claims.

Before joining Halpern May Ybarra Gelberg LLP, Ms. Thompson practiced at Skadden, Arps, Slate, Meagher & Flom LLP. Ms. Thompson earned her J.D. from the UCLA School of Law, where she graduated Order of the Coif. During her time in law school, Ms. Thompson served on the Women’s Law Journal and externed for the Honorable Otis D. Wright in the Central District of California. She received her undergraduate degree from the University of Georgia, where she graduated magna cum laude with a B.S. in Psychology.

Prior to attending law school, Ms. Thompson served as a program coordinator for an educational non-profit foundation.


  • University of California, Los Angeles School of Law, J.D. Order of the Coif, Women's Law Journal
  • University of Georgia, B.S. Magna cum laude, Psychology

Representative Cases

  • Represented a social media company in connection with a Department of Justice investigation involving allegations of fraud
  • Represented an indirect auto financing company in an antitrust suit involving claims of monopolization and attempted monopolization
  • Represented a major lender in a consumer class action relating to tax reporting
  • Represented an electronics consumer goods manufacturer in a consumer class action alleging violations of state consumer protection laws
  • Represented a Chinese peer-to-peer lending company in securing a dismissal with prejudice of federal securities class action claims
  • Represented the founder and former CEO of a semiconductor manufacturer in federal securities class action claims
  • Represented a prominent witness in a public corruption and obstruction of justice investigation led by the U.S. Attorney’s Office in Los Angeles
  • Representing a large health care provider in civil cases brought by states, counties, and municipalities alleging improper opioid distribution and dispensing


  • Hon. Otis D. Wright - Central District of California