Paul T. Horne is Chairman of the Board and also serves as Chief Executive Officer of Legacy and was appointed to this position effective March 1, 2015. Previously, Mr. Horne served as Executive Vice President and Chief Operating Officer from March 16, 2012 until his appointment as Chief Executive Officer. Prior to that, Mr. Horne served as Executive Vice President of Operations from our founding in October 2005 to March 2012. From January 2000 to October 2005, Mr. Horne served as Operations Manager of Moriah Resources, Inc. From January 1985 to January 2000, Mr. Horne worked for Mobil E&P U.S. Inc. in a variety of petroleum engineering and operations management roles primarily in the Permian Basin. Mr. Horne has a Bachelor of Science degree in Petroleum Engineering from Texas A&M University. Mr. Horne has 31 years of experience in the oil and natural gas industry with 29 years of experience in the Permian Basin.
Mr. Vann was appointed to the Board of Directors upon completion of our private equity offering on March 15, 2006 and was appointed Lead Independent Director on May 12, 2016. From 1970 through 1979, Mr. Vann was employed in the refining division of Exxon Company USA, and from 1979 through January 2001, Mr. Vann was employed by Koch Industries. From February 2001 through December 2004, Mr. Vann served as Chief Executive Officer of Entergy — Koch, LP, an energy trading and transportation company. Mr. Vann continues to serve Entergy as a consultant and serves on the board and consults with Texon, LP, a private energy marketing company. On May 8, 2006, Mr. Vann was appointed to the Board of directors of Crosstex Energy, L.P. (now EnLink Midstream Partners, LP), a publicy traded midstream master limited partnership. From January 2009 through June 2010, Mr. Vann served as an advisory board member for Enexus, LLC, which is a subsidiary of Entergy Corporation. In October 2012, Mr. Vann joined CCMP Capital Advisors, LLC, a private equity firm, as an Executive Advisor and serves on the boards of portfolio companies Chaparrel Energy, Inc. and Eco Services. Mr. Vann has a Bachelor of Science degree in Chemical Engineering, with honors, from the University of Kansas. Mr. Vann serves on the Board of Advisors for the School of Engineering at the University of Kansas, which selected him to receive its Distinguished Engineering Service Award in 2012.
Cary D. Brown is a member of our Board of Directors. Prior, Mr. Brown served as Chairman of the Board from March 2015 through May 2016, and Chairman and Chief Executive Officer since our founding in October 2005 through March 2015. Prior to October 2005, Mr. Brown co-founded two businesses, Moriah Resources, Inc. and Petroleum Strategies, Inc. Moriah Resources, Inc. was formed in 1992 to acquire oil and natural gas reserves. Petroleum Strategies, Inc. was formed in 1991 to serve as a qualified intermediary in connection with the execution of Section 1031 transactions for major oil companies, public independents and private oil and natural gas companies. Mr. Brown has served as Executive Vice President of Petroleum Strategies, Inc. since its inception in 1991. Mr. Brown served as an auditor for Grant Thornton in Midland, Texas from January 1991 to June 1991 and for Touche Ross in Houston, Texas from June 1989 to December 1990. Mr. Brown has a Bachelor of Business Administration degree, with honors, from Abilene Christian University. Mr. Brown has 25 years of experience in the oil and natural gas industry with 23 years of experience in the Permian Basin.
Mr. Granberry was appointed to our Board of Directors on January 23, 2008. Mr. Granberry has been a member of the board of directors of The Williams Companies, Inc. (an integrated gas company with exploration and production, midstream, and gas pipeline operations) from November 2005 to December 2011. In January 2012 he became a member of the board of directors of WPX Energy, Inc., which was spun off from The Williams Companies Inc. He was a member of Compass Operating Company, LLC, a small, private oil and gas exploration, development and producing company with properties in West Texas and Southeast New Mexico from October 2004 through December 2013. From 1999 through September 2004, he managed investments and consulted with oil and gas companies. He invested in and became a board member of Just4Biz.com (a start-up internet company engaged in online office supply) in 1999 and served as Interim CEO for brief periods in 2000 and 2001. Just4Biz.com filed for bankruptcy in May 2001. From January 1996 to May 1999, Mr. Granberry was President and Chief Operating Officer of Tom Brown, Inc., a public oil and gas company with exploration, development, acquisition and production activities throughout the central United States. Mr. Granberry earned Bachelor of Science and Master of Science degrees in Petroleum Engineering from the University of Texas and upon graduation, worked for Amoco Production Company for 16 years.
Mr. Lawrence has been a member of our Board of Directors since May 1, 2006. Mr. Lawrence is Chief Financial Officer and Vice President - Finance of Natural Gas Services Group (NGSG), a public company that provides small to medium horsepower compression equipment to the natural gas industry, and has served in this position since July 2011. Previously, Mr. Lawrence served as Controller of NGSG from September 2010 to January 2011 before being promoted to Treasurer, Manager of Accounting and Principal Accounting Officer of NGSG in January 2011. From June 2006 to September 2010, Mr. Lawrence was self-employed as a management consultant doing business as Crescent Consulting. From September 2006 to August 2009, he served as Chief Financial Officer on a contract basis for Lynx Operating Company, a private company engaged in oil and gas operations with a primary business focus on gas processing. From May 2004 through April 2006, Mr. Lawrence served as Controller of Pure Resources, an exploration and production company and a wholly-owned subsidiary of Unocal Corporation which was acquired by Chevron Corporation. From June 2000 through May 2004, Mr. Lawrence was a practice manager of the Parson Group, LLC, a financial management consulting firm whose services included Sarbanes Oxley engagements with oil and natural gas industry clients. From 1973 through May 2000, Mr. Lawrence was employed by Atlantic Richfield Company, a public oil and gas company (ARCO) where he most recently (from 1993 through 2000) served as Controller of ARCO Permian. Mr. Lawrence has a Bachelor of Arts degree in Accounting, with honors, from Dillard University.
Douglas W. York is a Co-Founder and Managing Director of Sequel Energy Group LLC. Sequel Energy Group was formed in November, 2016 to pursue investments in drilling joint ventures in North American resource plays. Doug has served in a number of managerial and executive roles during his tenure in the E&P sector, most recently as Co-Founder and Managing Member of privately held Sequel Energy, LLC (September 2006-July 2014). Sequel Energy, LLC was formed in September 2006 and was focused on the acquisition and development of operated and non-operated interests in Louisiana, Oklahoma and North Dakota prior to divesting its assets in late 2013 and early 2014. Before co-founding Sequel, Doug spent ten years (August 1996-March 2006) with St. Mary Land and Exploration Company (NYSE - SM), a publicly-traded company with operations in multiple U.S. basins, where he served as VP, Engineering and Acquisitions and later as EVP and COO. Mr. York served as Regional Engineer for the Northern Business Unit of the Rockies Region during three years (December 1993-July 1996) with Meridian Oil Company. Doug began his career with ARCO Oil and Gas Company (January 1984-November 1993) where his roles included Drilling Engineering, Reservoir Engineering and Planning. Doug holds a B.S. Degree in Petroleum Engineering from the University of Tulsa. He has served on the Boards of the Independent Petroleum Association of the Mountain States, Montana Petroleum Association, Petroleum Engineering Advisory Board at the University of Tulsa, KLR Energy Acquisition Corp. and the Development Board of Colorado UpLift. Mr. York was named a Director of Legacy Reserves Inc. on October 3, 2018.