Our executive officers have an average of over 25 years of experience in the oil and natural gas industry. Since 2006, our management team has invested over $900 million in oil and natural gas property acquisitions in the United States.
Eric Mullins was appointed Co-Chief Executive Officer and the Chairman of the board of directors of our general partner in May 2011. Mr. Mullins also serves as a Managing Director and Co-Chief Executive Officer of Lime Rock Resources, which positions he has held since April 2005 and October 2008, respectively. Prior to joining Lime Rock Resources, Mr. Mullins worked in the Investment Banking Division of The Goldman Sachs Group, Inc. from August 1990 to April 2005, serving as a Vice President from 1994 to 1999 and as a Managing Director from 1999 to April 2005. Mr. Mullins spent almost all of those 15 years at Goldman Sachs in the Energy & Power Group, where he led numerous financing, structuring, and strategic advisory transactions. Mr. Mullins is the Chairman of the YMCA Retirement Fund board of trustees and also serves on the board of directors of Anadarko Petroleum Corporation. Mr. Mullins is a graduate of Stanford University, with a Bachelor of Arts degree, and the Wharton School of the University of Pennsylvania, with a Master of Business Administration.
Charlie Adcock was appointed Co-Chief Executive Officer and a member of the board of directors of our general partner in May 2011. Mr. Adcock also serves as a Managing Director and Co-Chief Executive Officer of Lime Rock Resources, which positions he has held since May 2005 and October 2008, respectively. From 1993 to 2004, Mr. Adcock worked in various positions at The Houston Exploration Company, a publicly traded independent North American oil and natural gas producer, serving as its Senior Vice President from 2001 through December 2004, at which time he retired, and the head of its Acquisitions group from 1993 to 2000. Prior to joining Houston Exploration, Mr. Adcock held various engineering and managerial positions with NERCO Oil & Gas, Union Texas Petroleum, Apache Corporation, American Natural Resources and Aminoil USA. Mr. Adcock is a graduate of Texas A&M University, with a Bachelor of Science degree in Civil Engineering, and the University of St. Thomas, with a Master of Business Administration.
Jaime Casas was appointed Vice President, Chief Financial Officer and Secretary of our general partner in July 2011. Prior to joining our general partner in June 2011, Mr. Casas served as Vice President, Chief Financial Officer of Laredo Energy, a privately held oil and gas company, from May 2009 to June 2011. While at Laredo Energy, Mr. Casas’ primary responsibilities were managing accounting, finance and certain business development functions. From November 2008 until joining Laredo Energy in May 2009, Mr. Casas worked as an independent financial consultant. From 1999 to October 2008 and 1995 to 1997, Mr. Casas worked in various positions in the investment banking energy groups at Donaldson, Lufkin & Jenrette and at Credit Suisse following Credit Suisse’s acquisition of DLJ, including as a Director, Vice President, Associate and Analyst. While at Credit Suisse, Mr. Casas’ primary focus was on capital and advisory transactions for exploration and production companies. From 1993 to 1995, Mr. Casas worked for Accenture as a management information consultant in the energy group. Mr. Casas is a graduate of Texas A&M University, with a Bachelor of Business Administration degree, and the Wharton School of the University of Pennsylvania, with a Master of Business Administration.
Chris Butta was appointed Vice President and Chief Engineer of our general partner in May 2011. Mr. Butta also serves as the Vice President of Engineering and Chief Engineer of Lime Rock Resources, which positions he has held since October 2008. From July 2005 to October 2008, Mr. Butta served as the Vice President of Engineering of Lime Rock Resources. From 1991 through July 2005, Mr. Butta worked for Miller and Lents, Ltd., a leading domestic and international consulting firm specializing in oil and gas reserve evaluations and economic analyses. During his 14 years at Miller and Lents, Mr. Butta rose from Consulting Engineer to Senior Vice President. In those capacities, he analyzed oil and gas reserves throughout the United States to provide engineering reserve estimates. Prior to that, Mr. Butta spent nine years as an operations/analytical engineer at ARCO Oil and Gas Company. Mr. Butta is a graduate of the University of Missouri-Rolla, with a Bachelor of Science degree in Petroleum Engineering.
Tim Miller was appointed Vice President and Chief Operating Officer of our general partner in May 2011. Mr. Miller also serves as the Vice President of Operations and Chief Operating Officer of Lime Rock Resources, which positions he has held since October 2008. From May 2005 to October 2008, Mr. Miller served as Vice President of Operations of Lime Rock Resources. From 1984 until April 2005, Mr. Miller worked for El Paso Corporation and for Coastal Oil and Gas Company before it merged with El Paso in 2001. During this time, Mr. Miller served in positions of increasing responsibility, working as a petroleum engineer and rising to the position of Vice President-Upper Gulf Coast Production for Coastal Oil and Gas Corporation in 1999. After Coastal’s merger with El Paso, Mr. Miller served as Vice President-Gulf of Mexico Production, Vice President-Texas Gulf Coast Technical Group and finally Vice President, Texas Gulf Coast Division, where he was responsible for all of El Paso Corporation’s operations in the Gulf Coast area. From 1982 to 1984, Mr. Miller worked as a petroleum engineer for Petro-Lewis Corporation. Mr. Miller is a graduate of the University of Missouri-Rolla, with a Bachelor of Science degree in Petroleum Engineering, and Oklahoma City University, with a Master of Business Administration.