- A.T. Kearney
- AARP
- AARP
- AECOM
- Aetna
- Airlines for America
- Alion Science & Technology
- American Alliance of Museums
- American Chemical Society
- American College of Radiology
- American Hospital Association
- American Psychological Association
- American Red Cross
- Amtrak
- AREVA
- ASM Research
- Association of American Universities
- AstraZeneca - MedImmune
- AT&T
- BAE Systems, Inc.
- Baltimore County Government
- Beacon Roofing Supply, Inc.
- Bechtel Corporations
- Billy Casper Golf
- Bloomberg BNA
- Booz Allen Hamilton
- BT Americas
- Bureau of Prisons
- Capital One
- Carefirst
- CareFirst BCBS
- Carnegie Science
- Centrus Energy
- CFA Institute
- Christian Broadcasting Network
- Ciber, Inc.
- Citigroup
- College Board
- Command Security Corporation
- Cooley LLP
- Coppin State University
- County of Frederick
- CSC
- CUA
- DAI
- DCS Corporation
- DHS
- Digital Intelligence Systems (DISYS)
- Ellucian
- EPA-OCEF
- Eurpac Warehouse Sales
- Fannie Mae
- Federal Reserve Bank of Richmond
- GC Treasury SunPlus
- General Dynamics IT
| - George Washington University
- Germanna Community College
- Graham Holdings Company
- Hargrove, Inc.
- Hewlett Packard
- Howard Hughes Medical Institute
- HUD
- ICF International, Inc.
- ICMA-RC
- IDM
- Juniata College
- Kaiser Permanente
- L-3 National Security Solutions
- Lafarge SA
- Lockheed Martin
- Marine Corps Systems Command
- Marriott
- Maryland Motor Vehicle Administration
- Merkle, Inc
- MHM Services, Inc.
- MPR Associates
- NASA
- National Geographic Society
- Navy Federal Credit Union
- NJVC
- Northrop Grumman
- NSF
- Office of Justice Programs
- Office of Management and Budget
- Orrick
- Quintiles
- SAIC
- Sands Capital Management
- SBPASC
- Smithsonian Institution
- Sodexo
- SSA
- STG
- SWIFT
- Symantec
- The AES Corporation
- Treasury-IRS
- TSA
- U. S. Secret Service
- U.S. Dept. of Labor
- U.S. DOT
- U.S. Small Business Administration
- US Dept of Commerce
- USAF
- USDA
- Verizon
- Volunteers of America Chesapeake
- Wicomico County Public Schools
- Winrock International
- Wolseley
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