Petroleum Development Corp. Adds Board Member

Petroleum Development Corporation has announced the appointment of Mr. James M. Trimble to its Board of Directors, effective September 12, 2009. This appointment increases the number of Board members from eight to nine.

Mr. Trimble serves as Managing Director and Chief Executive Officer for the parent and US subsidiaries of Grand Gulf Energy Limited, a public company traded on the Australian Exchange. In January 2005, Mr. Trimble founded Grand Gulf Energy Company LLC, an Exploration and Development company focused primarily on drilling in mature basins in Texas, Louisiana and Oklahoma.

Prior to founding Grand Gulf Energy, Mr. Trimble served as President and Chief Executive Officer and Chairman of the Board of TexCal Energy LLC from June 2002 through December 2004. From July 2000 to December 2001, Mr. Trimble was President and a member of the Board of Directors of Elysium Energy L.L.C., an exploration and production company. From 1983 to 2000, he served as Senior Vice President - Exploration and Production of Cabot Oil and Gas Company, a publicly held, mid-sized exploration and production company.

Mr. Trimble graduated from Mississippi State University, where he majored in Petroleum Engineering for undergraduate and graduate studies. Richard W. McCullough, Chairman of the Board and CEO, said, "We are pleased Mr. Trimble has accepted our invitation to join the Board of Petroleum Development Corporation. His extensive executive level experience in E&P operations will be of great value to our Board."