Exhibit 99.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER ---------------------------------------- PURSUANT TO SECTION 1350 OF CHAPTER 63 OF THE UNITED STATES CODE ---------------------------------------------------------------- I, Thomas J. Falk, Chief Executive Officer of Kimberly-Clark Corporation, certify that: (1) the Form 10-Q, filed with the Securities and Exchange Commission on November 7, 2002 ("accompanied 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 accompanied report fairly presents, in all material respects, the financial condition and results of operations of Kimberly-Clark Corporation. /s/ Thomas J. Falk ----------------------- Thomas J. Falk Chief Executive Officer November 7, 2002