Exhibit 32.1
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
I, T. Paul Bulmahn, Chairman and Chief Executive Officer of ATP Oil & Gas Corporation (the “Company”), do hereby certify that this Amendment No. 1 to the Annual Report on Form 10-K (the “Report”) for the year ended December 31, 2004, filed with the Securities Exchange Commission on the date hereof:
| 1) | 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 represents, in all material respects, the financial condition and the results of operations of the Company. |
Date: April 29, 2005 | By: | /s/ T. Paul Bulmahn | ||
T. Paul Bulmahn | ||||
Chairman, Chief Executive Officer and President |
