- Allstate
- American Association of Endodontists
- American Cancer Society
- American Dental Association
- American Electronics Association
- American Farm Bureau Federation
- American Medical Association
- Association for Professionals in Infection Control – APIC
- The Art Institute of Chicago
- Association Forum of Chicago
- ASTD International Conference
- Better Homes and Gardens Real Estate Services
- Bituminous Insurance Companies
- BJC Consultants, Incorporated
- Blackman Kallick
- Blue Cross Blue Shield/Health Care Service Corporation
- Building Officials and Code Administrators International
- Calvin Klein Cosmetics – New York
- Chicago Hilton and Towers
- Chicago Mercantile Exchange
- Colony Group
- Construction Specifications Institute
- Crane Carton
- Depaul Alumni Association
- Dietary Managers Association
- Discover Financial Services Inc.
- Eli Lilly
- Evangelical Lutheran Church in America
- Exelon Corp.
- Federal Reserve Bank
- Fermilab
- Fertility Centers of Illinois
- The Gillette Company
- Great Clips, Inc.
- Helene Curtis, Inc.
- Healthcare Financial Management Association
- Healthcare Industry Distributors Association
- Illinois Association for Healthcare Quality
- Illinois Association of Park Districts
- Illinois Parks and Recreation Association
- Indian Health Services
- IREM
- Integramed Inc.
- Johannes Leonardo
- Joint Commission Resources
- Juno Lighting Group
- Kimball International
- Kimberly Clark
- Kohler Company
- Life Era
- Life Services Network
- Lutheran General Health Systems
- Mechanical Contractors Association
- Medical Group Management Association
- NALCO Chemical
- National Association of Realtors
- Nestle Foods Corporation
- Northern Trust
- OSI Restaurant Partners Inc.
- Panduit
- Quest International
- Radiological Society of North America
- Serta Inc.
- SHRM National Conference
- Shure Inc.
- Society of Insurance Educators and Trainers
- Society of Pharmaceutical and Biotech Trainers
- Spiegel Inc.
- Uniqema International
- United Behavioral Health
- U.S. Office of Personnel Management
- University of Chicago Hospitals
- Veterans Administration Medical Center
- Wendy’s International, Inc.
- Whirlpool Corporation
- Women’s Foodservice Forum
- Zenith Data Systems
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