Philip G. Behrman

Marathon Oil Co. explores, transports and markets crude oil, and natural gas. It focuses on oil and gas exploration and production in Angola, Canada, Equatorial Guinea, Norway, the UK and the US. The company was founded by Henry M. Ernst in 1886 and is headquartered in Houston, TX

Unocal Corp. explores, develops, produces, and markets crude oil and natural gas. The firm also produces geothermal energy in Indonesia and the Philippines and makes petroleum coke, graphite's and silicon carbide materials. The company was founded on October 17, 1890 and is headquartered in El Segundo, CA.

Vastar Resources, Inc. is one of the largest independent oil and natural gas exploration and production companies in the United States. The company is active in approximately 80 fields in some of the nation's most prolific producing areas, including the Gulf of Mexico, the Gulf Coast, the Oklahoma/Arklatex and the Rockies/Hugoton regions. In addition, the company's drilling rigs are exploring for new reserves both onshore and in the promising shelf and deepwater Gulf of Mexico drilling plays, the latter the site of rising industry activity and excitement.