O’Melveny Worldwide

Melissa Cassel is a litigator who focuses on complex and appellate litigation. She has authored briefs in multiple federal and state courts, including the US Supreme Court, on subjects including administrative law, criminal procedure, antitrust, defamation, products liability, and constitutional law. She has also argued in the US Court of Appeals for the Ninth Circuit.

Melissa maintains an active pro bono practice focused on criminal defense, immigration, free speech, and civil rights issues.

Prior to joining O’Melveny, Melissa served as a law clerk for the Honorable Julia Smith Gibbons of the US Court of Appeals for the Sixth Circuit.

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Bar Admissions

  • California

Court Admissions

  • US Court of Appeals, Second, Fifth, Sixth, and Ninth Circuits
  • US Supreme Court


  • University of Michigan Law School, J.D., magna cum laude, Order of the Coif
  • University of California at Berkeley, B.A., High Honors, Phi Beta Kappa

Professional Activities


  • Honorable Julia S. Gibbons, US Court of Appeals, Sixth Circuit