The Advisory Board Company

McDermott, Will & Emery

American Association of Retired Persons

McDonnell Douglas

American Medical Association

McGraw-Hill, Inc.

Amtrak

MedImmune

Andrews & Kurth

Merrill Lynch & Co.

AT&T

MTA (NYC)

AXA Financial

National Assoc. of Manufacturers

Baker & Hostetler

Oracle Corporation

Bank of America

Oryx Energy Company

Booz Allen & Hamilton

Paul Hastings

Choice Hotels

Phillips Publishing International

Computer Sciences Corporation

PNC Bank

Dow, Lohnes & Albertson

Proctor & Gamble

The Depository Trust Company

PRC, Inc.

Evolent Health

RTKL Associates

FannieMae

Shell Oil Company

Federal Deposit Insurance Corp (FDIC)

Skadden

Fidelity Investments

The Southern Company

Finnegan

Southwestern Life Insurance

General Dynamics

Student Loan Marketing Assoc.

Heery International

Sun Microsystems, Inc.

Hewlett Packard

Total Wine & More

Houston Metro Transit Authority

Verizon

IBM Corporation

Vinson & Elkins

The International Monetary Fund

Wiley Rein

Jones Day

Wilmer-Hale

JPMorgan Chase

WorldSpan

Legg Mason

Xerox Corporation

Marsh & McLennan

The World Bank