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 Input/Output, Inc. (the
"Company") on Form 10-Q for the period ending March 31, 2003 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), I,
Robert P. Peebler, President and Chief Executive Officer of the Company,
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 Company.

/s/ Robert P. Peebler
President and Chief Executive Officer
May 15, 2003