Joseph A. Mills was elected Chairman of the Board and Chief Executive Officer of EROC in May 2007. Additionally, Mr. Mills has served since April 19, 2006, and will continue to serve for the foreseeable future, as Chief Executive Officer and as a manager of Montierra Management LLC, which is the general partner of Montierra Minerals & Production, L.P., a privately held limited partnership that acquires, invests in and actively manages oil and gas mineral and royalty interests in the United States. From September 2003 to January 2006, Mr. Mills was the Senior Vice President of Operations for Black Stone Minerals Company, LP, a privately held company. From October 1999 to August 2003, Mr. Mills was a Senior Vice President of El Paso Production Company, and from January 1999 to October 1999, Mr. Mills was a Vice President of El Paso Production Company, a wholly-owned subsidiary of El Paso Corporation. Prior to joining El Paso, Mr. Mills held various executive and senior-level management positions with Sonat Exploration Company, a wholly owned subsidiary of Sonat, Inc.