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Gregory L. Mahaffey

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  • Member and President
Location:
Phone:
Fax:
405-236-1520
Email: 

Areas of Practice

  • Oil & Gas
  • Oklahoma Corporation Commission
  • Administrative Hearings & Adjudication
  • Administrative Rulemaking
  • Licensing
  • Regulatory Enforcement
  • Mediation
  • Mortgages & Foreclosures
  • Contracts
  • Debtor/Creditor
  • Joint Ventures
  • Mergers, Acquisitions & Divestitures
  • Secured Transactions
  • Transactions
  • Uniform Commercial Code
  • Warranties
  • Construction Liens
  • Construction Defects
  • Minerals & Mining
  • Cleanup & Superfund
  • Regulatory Compliance & Auditing
  • Water Pollution
  • Class Actions
  • Complex Litigation
  • Federal Appellate Practice
  • Federal Trial Practice
  • Multidistrict Litigation
  • State Appellate Practice
  • State Trial Practice
  • Water & Riparian Rights
  • Product Liability - Machinery & Tools

Litigation Percentage

  • 50% of Practice Devoted to Litigation

Bar Admissions

  • Oklahoma, 1975
  • U.S. District Court Eastern District of Oklahoma, 1978
  • U.S. District Court Western District of Oklahoma, 1975
  • U.S. District Court Northern District of Oklahoma, 1975
  • U.S. Court of Appeals 10th Circuit, 1978
  • U.S. Supreme Court, 1985

Education

  • University of Oklahoma College of Law, Norman, Oklahoma
    • J.D. - 1975
  • Texas Tech University
    • B.S.I.E. - 1972

Representative Cases

  • Withrow v. Red Eagle Oil Co., 755 P.2d 622, 1988, Okla., 1988027248
  • Stolz Wagner & Brown vs. J. Walter Duncan, 417 F. Supp. 552, 1976, W.D. Okla., 1976126817
  • PCX Corporation vs. Oklahoma Corporation Commission, 699 P. 2d 1103, 1984, Okla. Civ. App.
  • LPCX Corp. vs. Faulkner, 818 P.2d 431, 1991, Okla., 1991093435
  • French Petroleum vs. Oklahoma Corporation Commission, 805 P.2d 650, 1991, Okla., 1991024549
  • Nilsen vs. Ports of Call Oil Company, 711 P.2d 98, 1985, Okla., 1985162055
  • Arrowhead Energy Company v. Baron Exploration Company, 930 P.2d 181, 1997, Okla., 1996242036
  • Pitco Production Co. v. Chaparral Energy, 63 P.3d 541, 2003, Okla.
  • Fox v. Maulding, 112 F. 3d 453, 1997, 10th Cir.
  • Home-Stake Production Co. v. Talon Petroleum, CA, 907 F. 2d 1012, 1990, 10th Cir.
  • Sac and Fox Tribe of Indians of Oklahoma v. Apex Const. Co., Inc., 757 F.2d 221, 1985, 10th Cir.
  • Harding & Shelton, Inc. v. Prospective Inv. and Trading Co., 123 P.3d 56, 2005, Okla. Civ. App.

Representative Clients

  • Antioch Operating, LLC
  • Baron Exploration Company
  • Fairway Resources III, LLC
  • Marlin Oil Corporation
  • Newfield Exploration Mid-Continent, Inc.
  • Stephens Production Company

References

  • Bank of America
  • IBC Bank
  • Merrill Lynch

Honors and Awards

  • 2017 Eugene Kuntz Award

Professional Associations and Memberships

  • Oklahoma County Bar Association, Member
  • Oklahoma Bar Association, Member
  • American Bar Association, Member
  • Oklahoma City Mineral Lawyers Society, Member
  • Oklahoma City Mineral Lawyers Society, President, 1990 to 1991
  • First Presbyterian Church of Norman, Trustee and Foundation Member
  • Oklahoma City Association of Petroleum Landmen, Member
  • Tulsa Association of Petroleum Landmen, Member
  • Oklahoma Independent Petroleum Association, Member
  • Litigation Counsel of America, Fellow in Trial Lawyer Honorary Society