Exhibit 23.3
CONSENT OF INDEPENDENT PETROLEUM ENGINEERS
We hereby consent to the use of our reports, dated February 13, 2007, relating to the proved oil and gas reserves of ATP Oil & Gas Corporation (the “Company”) as of December 31, 2006, to the information derived from such reports and to the reference to this firm as an expert in the Form S-3 registration statement and any amendments thereto filed by the Company and in the prospectus to which the registration statement relates.
/s/ Graeme Simpson
Name: Graeme Simpson
Title: Director
RPS Energy
9 October 2007