- Science Applications International
Corporation (SAIC)
- Sanofi Aventis
- SAP America, Inc.
- Sarnoff Corporation
- Scattergood Associates
- S.C. Herman & Associates, Inc.
- Schering-Plough Corporation
- School District of Philadelphia
- Schweizerhall
- Science Center
- Scios
- Second Genesis
- Southeastern Pennsylvania Transportation
Authority (SEPTA)
- Sherwin Williams Company
- Shire Laboratories
- Securities Information Automation
Corporation (SIAC)
- Siemens Building Technologies, Inc. (SBT)
- Siemens Government Services, Inc.
- Siemens Medical Systems
- Sierra Biomedical
- Simon & Schuster
- Skanska USA Building Inc.
- Smith Barney
- Smithsonian Institution
- Social Security Administration
- Southeastern Massachusetts University
- Sovereign Bank
- Spaulding & Slye Colliers
- St. Lawrence UniversityStar Group
- Starizon
- Starwood Hotels
- State of Minnesota
- Station Casinos
- Stratosphere
- Strawbery Banke Museum
- Staubach Company
- StructureTone
- Susquehanna International Group
- Suzhou Industrial Park
- Switzer Group Inc.
- Syracuse University
-
- Tabor Academy
- Telcordia Technologies, Inc.
- Tellium Inc.
- Texaco Refining and Marketing Inc.
- Textron, Inc.
- TheraMed Inc.
- Thomas Financial Corporation
- Thomas Jefferson University
- Thomas Properties Group
- Thomson Financial
- Tinicum Properties
- Tishman Technologies Corp
- Total Project Solutions
- Trammel Crow Company
- Triage Capital Management
- True Position Inc.
- Tufts University
- Turner Construction Company
- Tyco International
-
- UBS Paine Weber
- Underwriters Management
- Unilever
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- Unisys
- United Laboratories Inc.
- United States Postal Service
- University of California at Santa Cruz
- University of Chicago
- University of Colorado
- University of Connecticut
Health Center
- University of Delaware
- University of Louisville
- University of Maryland
- University of Massachusetts
- University of Michigan
- University of Minnesota, Morris
- University of Virginia
- University of Pennsylvania
- University of Pennsylvania
Health System (UPHS)
- US Airforce
- US Army
- US Army Corps of Engineers
- US Coast Guard
- US Department of Agriculture
- US Department of the Army
- US Department of Defense
- US Department of Energy
- US Department of Justice
- US Department of State
- US Environmental Protection Agency
- US Federal Aviation Administration
- US Federal Bureau of Investigation
- US Federal Bureau of Prisons
- US Food and Drug Administration
- US General Services Administration
- US Institute of Peace
- US Library of Congress
- US Mint
- US National Aeronautics and
Space Administration
- US National Cancer Institute
- US National Institutes of Health
- US National Security Agency
- US Navy
- US Naval Research Laboratory
- US Pharmacopeia
- US Property & Fiscal Office
- US Postal Service
- US Veterans Administration
-
- Valeant Pharmaceuticals International
- Vanderbilt University
- Venetian Casino Resort
- Verizon
- Venture Corporation
- Villanova University
-
- W Hotels
- Walter Reed Army Institute of Research
- Whiting Turner
- Widener University
- Williams Jackson Ewing
- WGBH
- Wyeth
- Wyndham
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