- Babcock Power Environmental
- Bechtel Corporation
- Black & Veatch
- CEntry Constructors & Engineers
- Ford Bacon & Davis
- Foster-Wheeler USA
- Lurgi Chemie Metallurgie Industriebau
- Raytheon Engineers & Constructors
- Tampella Power Machinery
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- Bosque Power
- BP Products North America
- Crest Petroleum
- Enserch Exploration
- Grant Forest Products
- Lockheed Missiles & Space
- Oglethorpe Power
- Pioneer Natural Resources
- RAM Development
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- Beirne, Maynard & Parsons
- Berger & Montague
- Dunlap Fiore
- Foley Hoag
- Foltz Martin
- Ford Nassen & Baldwin
- GIbbs, Giden, Locher & Turner
- Gibson Dunn
- Hall Estill
- Kilpatrick Stockton
- Morgan, Lewis & Bockius
- Murtha Cullina
- Nexsen Pruet Adams Kleemeier
- Parr Brown Gee & Loveless
- Peel Brimley
- Posternak, Blankenstein & Lund
- Rutan & Tucker
- Seyfarth Shaw
- Smith, Currie & Hancock
- Sutherland Asbill & Brennan
- Watt, Teider, Hoffar & Fitzgerald
- Weil & Drage
- White & Case
- Wormser, Kiely, Galef & Jacobs
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