Companies: Past & Present
 
Altura Energy Ltd.
American Exploration
Anadarko Petroleum Corporation
Andersen Consulting, LLP
Apache International
Arthur D. Little, Inc.
Bechtel Corporation
Cliffs Drilling Company
Conoco, Inc.

Dominion Exploration & Production, Inc

El Paso Corporation

Ernst & Young/Wright Killen & Co., LLP
Exxon Company, U.S.A.
Exxon Production Research Company
Fina Oil & Chemical Company
Frontier Oil & Gas Company
Heat Transfer Research Institute

Houston Exploration Company
Hunt Oil Company
KBC Advanced Technologies, Inc.
Kerr-McGee Corporation
M. W. Kellogg Company
Maxus Exploration
Mobil Exploration & Producing, U.S., Inc.
Mobil Oil Corporation

Newfield Exploration Company
Pennzoil Company
Purvin & Gertz, Inc.
Schlumberger Companies
   Anadrill
   Dowell
   GeoQuest
   Integrated Project Management
   Oil Field Services
   Perforation and Testing
   Sedco Forex
   Wireline and Testing
Shell Companies
   Shell Offshore Company
   Shell Oil Company
   Shell Western Exploration & Production Inc.
Sonat Exploration Company

Southwestern Energy Company

St. Mary Land & Exploration Company
Union Texas Petroleum

Vintage Petroleum, Inc.

XTO Energy, Inc