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Kevin Hayes is a shareholder and senior litigator with the firm, specializing in energy and general commercial litigation. In addition, he serves as an Adjunct Settlement Judge and arbitrator. He is a past President of the firm and also served on the firm's Executive Committee. He is a Senior Member of the firm's Board of Directors.

Kevin is a graduate of the University of Tulsa College of Law and has been with Hall Estill since 1975. He has an individual AV Preeminent rating through Martindale-Hubbell.

Kevin's practice has historically focused on the representation of energy-related companies in property, construction and contractual right matters. In addition, he has represented clients in matters before the Federal Energy Administration in connection with wage and price control matters, has represented numerous gas pipeline companies in contractual dispute litigation, and has represented telecommunications companies in litigation concerning claims of landowners owning land adjacent to rights of way upon which fiber optic cable has been laid. Today, Kevin is involved as lead counsel in several major class actions involving oil and gas royalty owner claims.


  • University of Tulsa College of Law (J.D.)


  • Oklahoma (1975)
  • Oklahoma Supreme Court
  • U. S. District Court for the Northern, Eastern and Western Districts of Oklahoma
  • United States Court of Appeals for the Tenth Circuit
  • United States Supreme Court
  • Legal Aid Services of Oklahoma- Campaign for Justice Committee Member
  • Tulsa Area United Way - Former Board of Director
  • Booker T. Washington Foundation for Excellence - Former Board Member
  • All Souls Unitarian Church - Board Member; Endowment Committee Member
  • Chair, Committee on Admissions and Grievances, U.S. District Court for the Northern District of Oklahoma (2015-2018)
  • Oklahoma Bar Association
  • Oklahoma County Bar Association
  • Tulsa County Bar Association
  • Council Oak Chapter, American Inns of Court (Master), President-Elect
  • Senior Fellow, Litigation Counsel of America, Trial Lawyer Honorary Society
  • Gas Royalty Issues Arising from Direct Gas Marketing, presented at the Southwestern Legal Foundation's 43rd Annual Institute on Oil & Gas Law and Taxation
  • Gas Marketing Royalty Issues in the 1990's, presented at a Special Institute on Oil & Gas Royalties on Non-Federal Lands sponsored by the Rocky Mountain Mineral Law Foundation
  • Oil & Gas Law and Taxation Review and Discovery & Document Preservation Issues Presented by Royalty Owner Lawsuits as Affected by Mergers & Acquisitions and Statutes of Limitation Decisions, as a Special Institute on Private Oil & Gas Royalties sponsored by the Rocky Mountain Mineral Law Foundation
  • Recipient of the 2022 Eugene Kuntz Award for Leadership in Natural Resources Law and Policy, presented by the University of Oklahoma College of Law 
  • Recognized as a Best Lawyer in America in Bet-the-Company Litigation, Commercial Litigation and Energy Law
  • Recognized as a Super Lawyer in Oklahoma in Energy & Natural Resources Law
  • Recognized as a Local Litigation Star by Benchmark Litigation
  • Recognized as a "Senior Statesman" in Energy & Natural Resources Law by Chambers USA
  • Recognized as Best Lawyers' Tulsa Lawyer of the Year in Energy Law in 2011 and 2016
  • Recognized as Best Lawyers' Tulsa Lawyer of the Year in Bet-the-Company Litigation in 2020