J. Russell Porter has been a member of the Board and has served as our President and Chief Executive Officer since February 2004. From August 2006 until January 2010, he also served as Chairman of the Board. From September 2000 to February 2004, he served as our Chief Operating Officer. Mr. Porter has an energy focused background, with approximately 22 years of natural gas and oil exploration and production experience and five years of banking and investment experience specializing in the energy sector. From April 1994 to September 2000, Mr. Porter served as an Executive Vice President of Forcenergy, Inc., a publicly-traded exploration and production company, where he was responsible for the acquisition and financing of the majority of its assets across the United States and Australia. He currently serves as a director of Petrel Energy Ltd., an Australian listed exploration and development company with assets in Uruguay, Spain and Canada and formerly served as a director of Caza Oil & Gas, Inc., a publicly-traded exploration and development company listed on the Toronto Stock Exchange and the London AIM exchange. He has held no other directorship positions in publicly-traded companies during the last five years. Mr. Porter holds a Bachelor of Science degree in Petroleum Land Management from Louisiana State University and a MBA from the Kenan-Flagler School of Business at the University of North Carolina at Chapel Hill. Mr. Porter was chosen as a director because he is our Chief Executive Officer and has proven management skills. He has extensive knowledge of the natural gas and oil industry and experience in managing natural gas and oil assets as well as relationships with chief executives and other senior management of natural gas and oil companies and oilfield service companies throughout the United States. Mr. Porter actively participates in all facets of our business and has a significant influence on both its business strategy and daily operations. Mr. Porter resides in Houston, Texas, USA.
Michael A. Gerlich joined us in May 2005 as Vice President and Chief Financial Officer and was appointed Corporate Secretary on March 8, 2011. He was promoted to Senior Vice President and Chief Financial Officer on June 7, 2013. Mr. Gerlich has over 34 years of natural gas and oil accounting and finance experience. From 1999 until joining us in 2005, he held various accounting and finance positions at Calpine Natural Gas LP, a wholly-owned subsidiary of Calpine Corporation, an independent electric power generation company listed on the New York Stock Exchange. His last position at Calpine Natural Gas LP was Senior Vice President – Accounting and Finance for natural gas and oil operations of the wholly-owned subsidiary. From 1994 until 1999, Mr. Gerlich served as Vice President and Chief Financial Officer of Sheridan Energy, Inc., an independent natural gas and oil exploration company traded on the NASDAQ, which was acquired in 1999 by Calpine Corporation. Over a 12-year period prior to joining Sheridan Energy, Inc., Mr. Gerlich held various accounting and finance positions with Trinity Resources, Ltd., an independent natural gas and oil exploration and production company, with his last position being Executive Vice President and Chief Financial Officer. Prior to that, Mr. Gerlich was also with Deloitte LLP, where the focus of his practice was with energy related clients. Mr. Gerlich is a Certified Public Accountant and graduated with honors from Texas A&M University with a Bachelor of Business Administration degree in Accounting.
Stephen P. Roberts joined us in June 2017 as Senior Vice President and Chief Operating Officer. Mr. Roberts has over 29 years of experience in the oil and gas industry. Prior to joining Gastar, he was a Senior Vice President over the Anadarko and Arkoma asset groups at Jones Energy, Inc. and served as Senior Vice President of Drilling and Completions. During his 19-year tenure with Jones Energy, he was directly responsible for the drilling and completion of over 700 horizontal wells in seven different formations. Prior to joining Jones Energy, he held various positions of increasing responsibility with Marathon Oil Corporation and Samson Resources Corporation. Mr. Roberts holds a B.S. degree in Petroleum Engineering and a M.B.A. in Finance from Texas Tech University.
Keith R. Blair joined us in August 2005 as a Senior Staff Geologist and was promoted to Vice President, Exploration Manager in 2008. Mr. Blair has over 34 years of natural gas and oil experience. He has extensive working knowledge of natural gas and oil basins in Colorado, New Mexico, East Texas, West Virginia/Pennsylvania, Offshore Gulf of Mexico and the Texas/Louisiana Gulf Coast. Prior to joining us, from 1999 until 2005, he was an independent exploration geologist. From 1995 until 1999, Mr. Blair was a Senior Geophysicist at Schlumberger Limited. Prior to 1995, he held an Exploration Manager/Supervisor position at ConocoPhillips for 14 years. He began his career as a well logging engineer with Halliburton Company. Mr. Blair graduated from Texas A&M University with a Bachelor of Science degree in Geology.
Henry J. Hansen joined us in September 2005 as Vice President of Land. Mr. Hansen has over 34 years of land management experience. Prior to joining us, Mr. Hansen was Rocky Mountain Land Manager with El Paso Corporation, a natural gas and oil exploration, production and pipeline company, from 1999 until January 2003. From January 2003 until June 2004, he worked as an independent land consultant. Mr. Hansen returned to El Paso Corporation in June 2004, where he was a senior landman until joining us in September 2005. Mr. Hansen graduated from the University of Texas at Austin with a Bachelor of Business Administration in Petroleum Management.
Trent J. Determann joined us in August 2014 and was promoted to Vice President-Finance in November 2016. Prior to joining us, Mr. Determann was Manager-Financial Planning and Strategy for PetroPoint Energy Partners, LP (“PetroPoint”), a private equity-backed company formed to acquire and exploit mature conventional onshore oil and gas assets, from October 2012 until the company was sold in August 2014. Prior to PetroPoint, Mr. Determann worked for the energy group of RBC Capital Markets Global Investment Banking Division from October 2010 to October 2012. Mr. Determann began his career as an analyst in the Commercial Banking Group of BBVA Compass. Mr. Determann graduated from Louisiana State University with a Bachelor of Science in Finance.