Catherine L. Campbell is a Director whose practice involves litigation in both state and federal district and appellate courts representing clients in a wide range of matters including complex litigation involving municipalities, oil and gas, state pension systems, and labor and employment. She has defended class-action and collective actions. She has also represented law enforcement agencies before state courts of appeals in civil rights actions. Cathy also previously served as a member of the Firm’s Executive Committee.

Cathy served as law clerk to the Honorable Jerome A. Holmes, Judge for the United States Court of Appeals for the Tenth Circuit from 2006-2008.

Cathy served as co-chair of the Oklahoma Bar Association Appellate Practice Section in 2002. Cathy authored Evidence of Common Insurance to Show Expert Bias: The Rest of the Story, 68 Okla. B. J. 3001 (1997); Updates to Statutes Governing Oklahoma Practice and Procedure, 74 Okla. B. J. 1477 (2003); and Limited Liability in the Oilfield, 87 Okla. B. J. 76 (2016).

• University of Colorado (B.A., 1987)
• University of Oklahoma (J.D., with Distinction, 1991)

• Oklahoma Bar Association
• American Bar Association

• Represented employers in a number of employment-related class action and collective action wage and hour cases, and other class actions including data breach cases.
• Represented oil and gas companies in mineral owner disputes and contract issues.
• Represented municipalities and municipality-related entities in cases implicating the First and Fourth Amendments.
• Represented various State pension systems on appeals involving payment of benefits.
• Representing various entities regarding elections, initiative and referendum petitions, and the constitutionality of state-enacted legislation.
• Represented clients in more than one hundred appeals in both state and federal courts. Successful appeals have addressed a wide variety of issues ranging from oil and gas, sales tax, defamation, civil procedure, and constitutional law. Representative cases include:
  • American Airlines, Inc. v. State, 2014 OK 95, 341 P.3d 56
  • Stevens v. Fox, 2016 OK 106, 383 P.3d 269
  • Claude C. Arnold Non-operated Royalty Interest Props., L.L.C. v. Cabot Oil & Gas Corp., 2021 OK 4, 485 P.3d 817
  • Miami Bus. Servs., LLC v. Davis, 2013 OK 20, 299 P.3d 477
  • Celebrity Attractions, Inc. v. Okla. City Pub. Prop. Auth., 660 F. Appx. 600 (10th Cir. 2016)
  • Arnold Oil Props., LLC v. Schlumberger Tech. Corp., 672 F.3d 1202 (10th Cir. 2012)
  • Arnold Oil Props., LLC v. Schlumberger Tech. Corp., 508 F. Appx. 715 (10th Cir. 2013)
  • Tainor v. Apollo Metal Specialties, Inc., 318 F.3d 975 (10th Cir. 2002).
• Skilled in writing appellate briefs and delivering oral arguments in federal circuit courts of appeal
• Responsible for all facets of trial preparation in state and federal courts, including substantive brief writing
• Extensive experience includes the knowledge of labor and employment, banking, medical malpractice, insurance, commercial transactions and taxation matters
• Represented defendant clients in a number of class action certification hearings involving a major automotive manufacturer, the manufacturer of protective armor used by police departments, and pharmaceutical product manufacturers and commercial settings
• Represented defendant clients in a number of FLSA collective actions.

• Martindale-Hubbell BV® Distinguished™
• 405 Magazine Top Attorney in Appellate Law (2022-present)
• Best Lawyers®: Employment Law – Management (2024-present)
• Best Lawyers®: Workers’ Compensation Law – Employers (2024-present)
• Best Lawyers®: Oil and Gas Law (2023-present)
• Best Lawyers®: Litigation – Labor and Employment (2020-present)
• Best Lawyers®: Commercial Litigation (2019-present)