- Abbott
- Accenture
- Alcan Packaging
- Allstate
- American Medical Association
- American National Can
- Ameritech
- Andersen Consulting
- AT&T
- Baxter
- BDO
- Caterpillar
- Chicago Auto Show
- Cole Taylor Bank
- Comdisco
- Corn Products Intl.
- Dean Foods
- Dean Witter
- Elgin Recycling
- Exxon Mobil
- Financial Times
- First Penn-Pacific
- Foldcraft
- Fuji Film
- Galileo Intl.
- GE Capital Rail Services
- General Mills
- Glenview State Bank
- Golden Apple Foundation
- Google
- Green Schools National Network
- Henkels & McCoy
- Home Depot
- HSBC
- Hub International
- IHOP
- Integrated Project Management
- International Housewares Association
- Jewel/Osco
- Jones Lang LaSalle
- Keller Williams Realty Partners
- Kemper Financial
- Knowles
- Kraft Foods
- Lloyds Register
- Marriott
- Marsh USA
- McKinsey
- Monsanto
- Montgomery Watson Harza
- Motorola
- Nat. Alliance for Public Charter Schools
- National School Boards Association
- Northwestern University
- NuCare
- Panduit
- Pechiney
- Pfizer
- Puma AG
- Quaker Oats
- Relco Locomotives
- Safety-Kleen
- Sara Lee
- Searle Pharmaceuticals
- Stone Container
- Toyota
- United Airlines
- United Stationers
- University HealthSystem Consortium
- UOP
- Vetter Pharma
- Waste Management
- Wyeth Pharmaceuticals
- Zebra Technologies
- Zoetis
