- Adesso
- Alzheimer's Association
- American Chartered Bank
- American Hospital Association
- American Library Association
- American National Bank
- Ameritech Corporation
- Bank of America
- Chicago Botanic Garden
- Equity Office Properties, Inc.
- Everest Publishing
- First Chicago
- First Oakbrook Bancshares, Inc.
- G.D. Searle and Company
- Global Educational Consultants
- Harris Bank and Trust
- Hawthorne Realty Group, Inc.
- HighTower Advisers
- Holiday Corporation
- Household International, Inc.
- Illinois Tool Works, Inc.
- Intus Communications, Inc.
- John Nuveen and Company, Inc.
- Kraft Foods
- Lutheran General HealthSystem
- Mayer Brown LLP
- McCormick Foundation
- MGIC Investment Corporation
- MRX Midwest Realty Exchange, Inc.
- National Futures Association
- Northwestern University
- Park Bancorp, Inc.
- Peggy Martin, Inc.
- Premark International, Inc.
- Ravinia Festival Association
- Sage Strategic Solutions LLC
- Sara Lee Corporation
- The Promus Companies, Inc.
- The Wall Street Journal
- United States Gypsum Company
- WTTW
- YMCA of the USA