- ABB Lummus Global
- Accufleet
- Alto Technology
- Altus Oil and Gas
- Ashbrook Corporation
- Baker Concrete
- Barker Hughes
- Bechtel
- BFI
- Blaser Swisslube
- BP
- Burlington Resources International
- Canamere, Inc.
- Caterpillar
- Cemex
- Center Point Energy
- Chevron Texaco
- Citgo
- City of Houston
- CMS Oil amp; Gas
- Coastal
- Coastal Power
- ConocoPhillips
- Criterion Catalysts amp; Technologies
- Daimler Chrysler
- DHL Airways, Inc.
- DirectoryOne
- Dow Chemical
- Dresser – Rand
- El Paso Energy
- El Paso Production
- Engelhard
- Enron
- e-Production Solutions
- Exxon Mobile
- Faithful amp; Gould
- French Consulate
- Fugro
- GDF Suez Energy
- General Plastics and Composites
- Global Santa Fe Corporation
- Greater Gulf Medical Alliance, Inc.
- Grupo Mayan
- GS Tech
- Halliburton Energy Services
- Harken Energy Corporation
- Hewlett Packard
- Hines Interests
- Honeywell
- HydroChem Industrial Services, Inc.
- I.R.S.
- Industrial Safety solutions
- Ingersoll
- Ingersoll Dresser Pump
- Interface Consulting
- Jones amp; Granger
- Kampgrounds of America
- Ken-zo Co.
- Kyphon
- Laredo Energy
- Levcor, Inc.
- Mantech
- Marathon Oil Co.
- Marubeni Plant Contractor, Inc.
- McKinney & McKinney’LLP
- Metro City Construction, L.P.
- Michael Petroleum Corporation
- Moritz amp; Associates
- NDC
- Occidental Energy
- OES Oilfield Services
- Omron Oilfield E` Marine
- On the Spot
- Oxy Inc.
- Pasadena Refining
- Pemex
- PetrEX International
- PMI Holdings
- PMI Services
- Pricewaterhouse Coopers LLP
- Pride International
- Rags in a Box
- Reliant Energy
- Republic Waste Management
- Resort Quality Control
- Richards Hogg Lindley
- Royal Oaks Fine Properties
- Ryland Homes
- Saipem America Inc.
- Sanchez Oil amp; Gas
- Saxet Petroleum
- Schlumberger
- Sermatech Dynamic
- Servomex
- SGI
- Shell Chemical
- Shell Lubricants
- Shell Oil Co.
- Shell Synthetics, Inc.
- Solutia Inc.
- Staffmark
- Stanford Eagle Group
- Sulzer Hickman
- Synetix
- T3 Energy Services
- Tam International
- Technip
- Tennessee Gas Pipeline
- Texas Children’s Hospital
- Texas Department of Criminal Justice
- Texcaliber Armour
- Tex-Tube
- The Men’s Wearhouse
- Tideland
- Trade Maker Homes
- Tru-Logistics
- Tubacero International, Inc.
- Vam Drilling USA, Inc.
- Veritas
- Warren Electric
- Waterous amp; Company
- Weatherford Compressions
- Weatherford Enterra
- WesternGego/Division of Schlumberger
- Willbros, USA, Inc.
- Wood Mackenzie
- Your University
- ZERO