EX-99.906CERT CERTIFICATION PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT I, Bruce N. Alpert, Principal Executive Officer & Principal Financial Officer of Gabelli Equity Series Funds, Inc. (the "Registrant"), certify that: 1. The Form N-CSR of the Registrant (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. Date: 12/5/2003 /s/ Bruce N. Alpert ---------------- -------------------------------------------------------- Bruce N. Alpert, Principal Executive Officer & Principal Financial Officer