- Advanced Petro Technologies, LLC
- AGOC
- Alex E. Paris Contracting Company
- American Water
- Austin Master Services
- Babst Calland
- BakerHostetler
- Bertison-George
- Beveridge & Diamond, P.C.
- Borton-Lawson Engineering
- Buchanan, Ingersoll & Rooney, PC
- Center Rock, Inc.
- Civil & Environmental Consultants, Inc.
- Cleveland Brothers Equipment Company
- Cohen & Grigsby
- Cozen O’Connor
- Dawood Engineering, Inc.
- Deloitte LLP
- Dieffenbauch & Hritz, LLC
- DiGioia Gray & Associates
- Eckert Seamans Cherin & Mellott, LLC
- Ecosystem Investment Partners
- EDGE LNG
- Endeavor Professional Services
- Environmental Standards, Inc.
- ERM
- Eurofins TestAmerica
- Fox Rothschild
- FTI Consulting
- Fuel Freedom Foundation
- GA BIBIKOS, LLC
- GEI Consultants, Inc.
- GeoStabilization International
- Geosyntec
- Gilmore & Associates
- Golder
- GPD Group
- Groundwater & Environmental Services
- Halliburton Energy Services
- Highland Field Services
- Holloman Corporation
- HRI, Inc.
- Hull & Associates
- HydroEdge Solutions
- K&L Gates
- Keystone Consultants
- Larson Design Group
- Leidos, Inc.
- Manko, Gold, Katcher & Fox
- Markosky Engineering Group, Inc.
- McGuire Woods
- McKim & Creed, Inc.
- McNees Wallace & Nurick, LLC
- Michael Baker International
- Mirage MarCom
- Monaloh Basin Engineers
- Moody & Associates, Inc.
- Mott MacDonald
- Nemacolin Woodlands Resort
- New Pig Energy
- Nuverra Environmental Services
- Orion Strategies
- Overstreet & Nestor, LLC
- Penn Environmental and Remediation, Inc.
- Penn State Hospitality Services
- Pennsylvania One Call System, Inc.
- Post & Schell, P.C.
- Project Canary
- Renegade Services
- Reserved Environmental Services
- Ridge Policy Group
- S&T Bank
- Saul Ewing, Inc.
- Schlumberger Oilfield Services
- Schneider Downs & Company
- SDI Gas LLC
- Stahl Sheaffer Engineering
- Steel Nation
- Steptoe & Johnson PLLC
- Stone & Webster, Inc.
- SWCA Environmental Consultants
- Tetra Tech, Inc.
- The Gateway Engineers
- The Thrasher Group
- The Tri-M Group
- Trinity Consultants, Inc.
- Universal Pressure Pumping, Inc.
- USA Compression
- Wade Trim
- WallacePancher Group
- Waste Management Energy Services
- Wild Well Control, Inc.
- Woodard & Curran
- WSP | Parsons Brinckerhoff
