Exhibit 31.1
CERTIFICATION
I, Richard W. McCullough, certify that:
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| 1. | I have reviewed this Annual Report on Form 10-K/A of Petroleum Development Corporation. |
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| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
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| Date: | May 18, 2011 | | /s/ Richard W. McCullough |
| | | | Richard W. McCullough |
| | | | Chief Executive Officer |
