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 FEI Company (the “Company”) on Form 10-Q for the quarterly period ended June 30, 2002 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), each of the undersigned officers of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that to such officer’s 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.

VAHE A SARKISSIAN

Vahé A. Sarkissian

President and Chief Executive Officer

August 14, 2002

STEPHEN F. LOUGHLIN

Stephen F. Loughlin

Vice President of Finance and

Acting Chief Financial Officer

August 14, 2002