3Com
Abbott Labs
ABG Investment Group, Inc
ABN-AMRO
Accenture
AC Nielsen
Acxiom Corporation
ADAP, Inc.
ADP Dealer Services, Inc.
Advanced IT Solutions, Inc.
Allstate Corporation
AmbironTrustwave
American Capital Strategies
American Management Systems
American Mobile
American Society of Anesthesiologists
Apple, Inc.
Arthur D. Little
AT & T
Attorney's Liability Assurance
Bank of Montreal
Barchart.com
Baxter Healthcare
BEZ Systems
BlueCross BlueShield Association
The Boeing Company
Boise Office Solutions
Booz Allen Hamilton
The Boston Consulting Group
Brunswick Corporation
Burwood Group
C & R Research
Carr Futures, Inc.
Catalyst Schools Chicago
CCH, Inc.
CDPI/NAH
Central Intermodal, Inc.
Chartered Benefit Services
Chase
Chicago Board Options Exchange
Chicago Equity Partners, LLC
Chicago Stock Exchange
Chicago Tribune
Children's Memorial Hospital
CIFCO of America
Cisco Systems, Inc.
Cision
Citrix Systems
City of Chicago
City of Lake Forest
CNA Insurance
CNH Global
Commonwealth Edison
CommWorks Corp.
CompTIA
Computer Associates International
Compuware
Concerted Systems. LLC
Concourse Communications
Community Counseling Centers of Chicago(C4)
Convergys, IMG
Coyote Logistics
Crane Plumbing
CSC Consulting
C. W. Costello
CyberLoan
DeLoitte & Touche Tax Technologies
DePaul University
Diamond Cluster
DND Express
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Donnelly Enterprise Sol, Inc.
Dunn Systems, Inc.
Duo Consulting
EMC^2
Erie Neighborhood House
Ernst & Young
Et Alia
Exact Software
Exelon Corp.
Exodus Communications
Federal Reserve Bank of Chicago
First Analysis Corporation
First Health Group Corp
First Options of Chicago
Forsythe Solutions
Four Seasons Hotel & Resort
Fujitsu Consulting
GE Financial Assurance
GE Healthcare
GE Medical Systems
General Motors
GES Exposition Services
Goldman Sachs
Grande Cheese Company
Hallmark Data Systems
Harley-Davidson Financial Services, Inc.
HAVI Global Solutions
HCL America
Hewitt Associates
Hewlett Packard Co.
Holly Hunt, Ltd.
HSBC
I.B.S.
IBM Global Services
IMC Global, Inc.
International Truck and Engine
ISI Telemanagement Solutions, Inc.
John Galt Solutions
Juno Investments, LLC
Kellogg Company
Ken Cook Co.
Kirkland & Ellis
KPMG Consulting
LaSalle Education Network
Lason, Inc
Loyola University
LTV Copperweld
Lucent Technologies
Magna Health Systems. LLC
Magnetrol International, Unc.
Maine Township H.S. District
Marsh USA, Inc.
MCI
McDonald's Corporation
McMaster-Carr Supply Co.
Mercy Health Centers
Metavante
Midwesco, Inc.
MMI Companies, Inc.
Monsanto Company
Moore North America
Morgan Stanley Discover
Motorola
Morningstar
MSDW Discover Financial Services
National Board of Osteopathic Medical Examiners
National Futures Association
NAVTEQ
NCR
NEC Technologies
Netscape Communications
NeuStar, Inc.
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Niles Township High School
The Northern Trust Company
Northwest Community Hospital
Northwestern University
NU Medical School
Nypro ADC
Ocean Tomo
Oldcastle APG Midwest
Oil-Dri Corp. of America
Orbitz.com
Panduit Corp.
Parker Hannifin Corporation
People's Gas
PeopleSoft, Inc.
Pivotal Corporation
PrairieComm
Price Waterhouse LLP
PrimeCo
The Private Bank & Trust
Quickset International
Rauland-Borg Corp.
Research in Motion, LTD
Revere Group
Richard J. Daley College
Rosalind Franklin University
Russell Reynolds
Ryan Herco Products, Co.
Sageo
Salomon Smith Barney
SBC Ameritech
SBC Datacom
Scotia-McLeod/Toronto
Sears Corporation
Serigraph, Inc.
Siemens Medical Systems
Specialty Print Communications
Sprint Global Business
StayinFront, Inc.
Strategic Hotel Capital
Strattec
Security Corp.
Switchfast Technologies
SXC Health Solutions
Technium, Inc.
Technology Research Consulting
Tellabs Operations, Inc.
Terrell & Terrell, CPA's
Thompson Financial Media
Thomson
TMP Worldwide
Trading Technologies, Inc.
Trans Union
Trebron Management
The University of Chicago
United Airlines
UOP
US Cellular
Verizon Wireless
Video Master, Inc.
VW Credit, Inc.
Walgreen Co
Walsh Construction.
Wellpoint, Inc.
Whittman-Hart
Whyte Hirschboeck Dudek Legal Services
William Mercer
WM Wrigley Jr Co.
W.W. Grainger
YJT Solutions
Zacks Investment Research, Inc
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