John D. Underwood

HEYCO Energy Group, Inc. explores and distributes oil and gas. It focuses on geology, geophysics, reservoir engineering, land management, international negotiation, drilling and production, and operations management; oil and gas reserves, and mineral leases or licenses in various project areas in the Permian Basin and East Texas in the U.S., as well as in Spain, the United Kingdom and Morocco. The company was founded in 2001 and is headquartered in Roswell, NM.

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.

The Society of Exploration Geophysicists operates as an association of exploration geophysicists. The non-profit company is based in Tulsa, OK and has subsidiaries in the United States.

One of the largest independent producers located in the U.S., Houston- based Union Texas Petroleum Holdings, Inc. explores for and produces oil and gas overseas primarily in the U.K. North Sea, Indonesia, Venezuela, Pakistan and other strategic areas. The company has petrochemical operations in Louisiana

ExxonMobil Oil Corp. operates gas stations and produces petroleum related products. The company was founded on August 24, 1959 and is headquartered in The Woodlands, TX.