100 N. Broadway Ave., Suite 1700
Oklahoma City, OK 73102
Phone: 405-232-0621
Fax: 405-232-9659

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Greg A. Castro


Greg Castro has 36 years of litigation experience. He concentrates his practice on commercial litigation, including business torts, intellectual property and patent infringement. He has appeared in federal and state courts across the country on matters relating to complex business litigation, intellectual property, antitrust, products liability and personal injury. His experience includes representing insurers against allegations of insurance bad faith, and other companies in prosecution and defense of business-related torts and disputes.

Castro served as co-counsel in a patent/antitrust lawsuit wherein he won $20,000,000 for his clients – a verdict ultimately upheld by the U.S. Supreme Court. This case – Unitherm Food Sys., Inc. v. Swift Eckrich, Inc., 546 U.S. 394 – is recognized as a Supreme Court precedent for the requirement of a Rule 50(b) motion for challenges to the sufficiency of evidence.


  • Juris Doctor (The University of Oklahoma, 1986)
  • Bachelor of Science (Oklahoma State University, 1983)

Bar Admissions

  • Oklahoma, 1986
  • U.S. District Courts for the Western, Northern and Eastern Districts of Oklahoma
  • U.S. Supreme Court
  • U.S. Court of Appeals for the 5th Circuit
  • U.S. Court of Appeals for the 10th Circuit
  • U.S. Court of Appeals for the Federal Circuit

Professional Memberships

  • American Bar Association
  • Oklahoma Bar Association
  • Oklahoma County Bar Association

Awards & Honors

  • Super Lawyers
  • The Best Lawyers in America
    • Litigation - Intellectual Property (2019-2022)
    • Trade Secrets Law (2021-2022)
    • Commercial Litigation (2021-2022)
  • Best Lawyers, Lawyer of the Year (2022)
    • Intellectual Property
  • Martindale-Hubbell, AV Preeminent Rating

Representative Matters & Clients

Castro’s clients include businesses and intellectual property firms that regularly deal in licensing and enforcement of their intellectual property, including patent rights, copyrights and trademarks. He has handled patent infringement and other intellectual property disputes in numerous federal district courts, and he has handled numerous complex business matters and resolved corporate disputes through litigation, arbitration, mediation and negotiation.

Published Cases

  • Unitherm Food Systems, Inc. v. Swift-Eckrich, Inc. d/b/a ConAgra Refrigerated Foods, 546 U.S. 394, 126 S.Ct. 980