CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

                                  Exhibit 99.1

In connection with the Annual Report of Univest Corporation of Pennsylvania on
Form 10-K for the period ended December 31, 2002 as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), the undersigned, in
the capacity and on the date indicated below, hereby certifies pursuant to 18
U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley
Act of 2002, that to his 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 operation of the Company.

/s/ William S. Aichele
- ----------------------
William S. Aichele
Chief Executive Officer
February 11, 2003