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- American Petroleum Institute (API)
- Apache Corp.
- Berry Petroleum Company
- Bonanza Creek Energy Operating Co.
- BP America Production Company
- BP Canada Energy Company
- Chesapeake Energy Corporation
- City of Glendale, CA
- Comstock Resources, Inc.
- CRBE-Nissan
- Crestwood Midstream
- Crosstex Energy Services, L.P.
- Denbury Resources, Inc.
- Devon Energy Corporation
- ENI US Operating
- Environmental Defense Fund
- EPCO Holdings, Inc.
- Exterran International Holdings, Inc.
- Forest Oil
- Fritz Industries
- Halliburton Energy Services
- Harbison Fischer
- High Plains Technical Services
- Kosmos
- Love’s Truck Stops & Country Stores
- MarkWest Energy Company
- Moyes & Co. Inc.
- North Texas Municipal Water District
- Northern Trust Bank
- Occidental Permian Ltd.
- Pioneer Natural Resources USA, Inc.
- Quanta Services Inc.
- Quicksilver Resources, Inc.
- Regency Intrastate Gas, LLC
- SAIC/US Air Force
- St. Mary Land & Exploration Company
- Stoltz & Company
- Terralliance and Energy Operations Nevada , LLP
- The Rice Foundation
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