Exhibit 99.1

Certification of Principal Executive Officer
Pursuant to 18 U.S.C. Section 1350, As Adopted Pursuant to Section 906 of
the Sarbanes-Oxley Act of 2002

I, Gerhard Neumaier, the principal executive officer of Ecology and
Environment, Inc. (the "Company") hereby certify pursuant to 18 U.S.C.
Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, to the best of my knowledge: that the Form 10-Q of the Company for
the three months ended October 26, 2002 accompanying this certification
(the "Report") fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934 and that the information
contained in the Report fairly presents, in all material respects, the
financial condition and the results of operations of the Company.  This
Certification is made to comply with the provisions of Section 906 of
the Sarbanes-Oxley Act and is not intended to be used for any other purpose.

Date:  December 10, 2002

                                By:   GERHARD J. NEUMAIER
                                     --------------------------------
                                      GERHARD J. NEUMAIER
                                      PRESIDENT - PRINCIPAL EXECUTIVE
                                      OFFICER