Exhibit 32.1

                             CERTIFICATION PURSUANT TO
                   SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

         I, Manuel D. Medina, hereby certify, pursuant to 18 U.S.C.ss.1350, as
adopted pursuant to ss.906 of the Sarbanes-Oxley Act of 2002, that:

         (1) The accompanying quarterly report on Form 10-Q for the fiscal
quarter ended June 30, 2003 fully complies with the requirements of Section
13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended; and

         (2) The information contained in such report fairly presents, in all
material respects, the financial condition and result of operations of Terremark
Worldwide, Inc.


Date:  August 13, 2003

                                       /s/ Manuel D. Medina
                                       -----------------------------------------
                                       Manuel D. Medina
                                       Chief Executive Officer