Exhibit 99.1
CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
Each of the undersigned hereby certifies, in his capacity as an officer of The Corporate Executive Board Company (the “Company”), for purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of his knowledge:
| • | The Annual Report of the Company on Form 10-K/A for the annual period ended December 31, 2002 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and | ||
| • | The information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company. |
| /s/ James J. McGonigle James J. McGonigle Chairman of the Board of Directors and Chief Executive Officer July 3, 2003 |
| /s/ Timothy R. Yost Timothy R. Yost Chief Financial Officer July 3, 2003 |