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 Quarterly Report of International Paper Company (the
"Company") on Form 10-Q for the period ending June 30, 2002 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I, John T.
Dillon, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C.
'SS'1350, as adopted pursuant to 'SS'906 of the Sarbanes-Oxley Act of 2002,
that, to the best of my knowledge:

         (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
Company.


/s/ John T. Dillon

John T. Dillon
Chairman and Chief Executive Officer
August 13, 2002


This certification accompanies the Report pursuant to 'SS'906 of the
Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the
Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of
'SS'18 of the Securities Exchange Act of 1934, as amended.