Earl Krieg

Society of Petroleum Engineers, Inc. provides petroleum engineering services. The non-profit company is based in Allen, TX and has subsidiaries in United States, India and Canada.

Magnum Hunter Production, Inc. provides oil exploration and drilling services. The company also provides evaluation of geological and geophysical information. It provides services to non-operators and other industry partners. Magnum Hunter Production is headquartered in Irving, TX

Wiser Oil Co. engages in exploration and development of oil and gas in Texas, New Mexico, the Gulf Coast and Western Canada. It markets its production of oil, natural gas and NGLs to purchasers, including large refiners and resellers, pipeline affiliate marketers, independent marketers, utilities and industrial end-users. The company was founded in 1905 and is headquartered in Dallas, TX.

Part of Osaka Gas Co., Ltd., Edisto Resources Corp. explores and produces oil and gas. The company is based in Houston, TX. Edisto Resources was acquired by Forcenergy, Inc., part of Osaka Gas Co., Ltd. from December 07, 2000 on October 22, 1997 for $139.61 million.

General Oil Co., Inc. provides trading services for acquisition and negotiation of physical liquid energy commodities. The firm trades for its system, physical crude, distillates, residual fuel oil, feedstock’s, LPG, lubricants, and asphalt. It also provides its clients and partners with trading services for the acquisition and negotiation of physical liquid energy commodities, including hedging, price risk management, financing, transportation, and storage. The company was founded in 1997 and is headquartered in New York, NY.

Keystone Petroleum NM LLC develops low to moderate risk drilling programs. The company was founded in May 2009 and is headquartered in Irving, TX.

Gruy Petroleum Management Co. is engaged in extraction of petroleum products. The company is located in Irving, TX.