Exhibit 23.3

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS

We hereby consent to the use of our report, dated February 14, 2012 relating to the proved oil and gas reserves of ATP Oil & Gas Corporation as of December 31, 2011, to the information derived from such report and to the reference to this firm as an expert in the annual report on Form 10-K.

/S/ Ryder Scott Company, L.P.

TBPE Firm Registration No. F-1580

Houston, Texas

March 9, 2012