Exhibit 32.1


                        Certification of CEO 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 on Form 10-Q/A of GAMCO Investors, Inc.
(the "Company") for the quarterly period ended March 31, 2006 as filed with the
Securities and Exchange Commission on the date hereof (the "Report"), Mario J.
Gabelli, as Chief Executive Officer of the Company, hereby certifies, pursuant
to 18 U.S.C. ss. 1350, as adopted pursuant to ss. 906 of the Sarbanes-Oxley Act
of 2002, that, to the best of 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 operations
          of the Company.


/s/ Mario J. Gabelli
--------------------
Name:  Mario J. Gabelli
Title: Chief Executive Officer
Date:  April 13, 2007

This certification accompanies the Report pursuant to ss. 906 of the
Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the
Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of ss.18
of the Securities Exchange Act of 1934, as amended.