Gregory L. Mahaffey
- 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
- Joint Ventures
- Mergers, Acquisitions & Divestitures
- Transactions
- Warranties
- Minerals & Mining
- 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
- EOG Resources, Inc.
- Marlin Oil Corporation
- Ovintiv USA, Inc.
- Oxley Energy, LLC
- 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
Litigation
- 30%