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

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 officers of Wilson
Greatbatch Technologies, Inc. (the "Company"), does hereby certify, to such
officer's knowledge, that:

The Quarterly Report on Form 10-Q for the quarter ended April 4, 2003 (the "Form
10-Q") of the Company fully complies with the requirements of section 13(a) or
15(d) of the Securities Exchange Act of 1934 and the information contained in
the Form 10-Q fairly presents, in all material respects, the financial condition
and results of operations of the Company.

A signed original of this written statement required by Section 906 has been
provided to the Company and will be retained by the Company and furnished to the
Securities and Exchange Commission or its staff upon request.

Dated: May 16, 2003                    /s/ Edward F. Voboril
                                           -------------------------------------
                                           Edward F. Voboril
                                           Chairman of the Board, President and
                                           Chief Executive Officer

Dated: May 16, 2003                    /s/ Lawrence P. Reinhold
                                           ------------------------------------
                                           Lawrence P. Reinhold
                                           Executive Vice President and
                                           Chief Financial Officer