Exhibit 99.1

 

CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

 

In connection with the Annual Report of United States Steel Corporation (the “Corporation”) on Form 10-K for the period ending December 31, 2002 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas J. Usher, Chairman of the Board of Directors and Chief Executive Officer of the Corporation, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

 

(1)                                  The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

 

(2)                                  The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

 

 

	By	/s/ Thomas J. Usher
		Thomas J. Usher
		Chairman of the Board of Directors and Chief Executive Officer
March 10, 2003