In training and consulting, what matters most is does the student/client understand the concepts, i.e. can the instructor/consultant put over the subject matter even when it may be complex. Regarding this, here are a few sample unsolicited references that I, as President of LCI, am very proud of:

ABB KENT-TAYLOR LTD. (England)
ACT – (England)
ADP
AMERICAN PRESIDENT LINES
AMERIQUEST MORTGAGE
AMERICAN STORES
BANK OF AMERICA
BENEFIT CONSULTANTS
CALIFORNIA STATE Agencies
CHARLES SCHWAB & CO.
CHUGACH ELECTRIC
COLUMBUS STEEL (South Africa)
COMPASSION INTERNATIONAL
DELL COMPUTERS
ESPRIT DE CORPS
FEDERAL EXPRESS

FEDERAL RESERVE BANKS
FISHER INVESTMENTS
FRANKLIN RESOURCES
FRITZ INFORMATION SERVICES
GIGA INFORMATION GROUP (USA & Europe)
HEWLETT PACKARD
ORACLE
PACIFIC BELL
PACIFIC GAS & ELECTRIC
PAYCHEX
TOYOTA
UNIHEALTH
US FEDERAL GOVERNMENT agencies
WARIA
WELLS FARGO BANK
WEYERHAUSER COMPANY
WGS (France)