Leadership

Mark E. Ellis is the Chairman, President and Chief Executive Officer and has served in such capacity since December 2011. He previously served as President, Chief Executive Officer and Director from January 2010 to December 2011 and from December 2007 to January 2010, Mr. Ellis served as President and Chief Operating Officer of the Company. Mr. Ellis is a member of the Society of Petroleum Engineers and the National Petroleum Council. Mr. Ellis serves on the boards of the Independent Petroleum Association of America, American Exploration & Production Council, Industry Board of Petroleum Engineering at Texas A&M University, Houston Museum of Natural Science and The Center for the Performing Arts at The Woodlands. In addition, he is Chairman of the Board for The Center for Hearing and Speech, and holds a position as trustee on the Texas A&M University 12th Man Foundation Board of Trustees.

Kolja Rockov is the Executive Vice President and Chief Financial Officer and has served in such capacity since joining the Company in March 2005. Mr. Rockov has more than 15 years of experience in the oil and natural gas finance industry. From October 2004 until he joined the Company in March 2005, Mr. Rockov served as a Managing Director in the Energy Group at RBC Capital Markets, where he was primarily responsible for investment banking coverage of the U.S. exploration and production sector. Mr. Rockov is the founding chairman of a philanthropic organization benefiting Texas Children’s Cancer Center in Houston, which has raised more than $1 million since 2009.

Arden L. Walker, Jr. is the Executive Vice President and Chief Operating Officer and has served in such capacity since January 2011. From January 2010 to January 2011, he served as Senior Vice President and Chief Operating Officer. Mr. Walker joined the Company in February 2007 as Senior Vice President, Operations and Chief Engineer. Mr. Walker is a member of the Society of Petroleum Engineers and Independent Petroleum Association of America. He also serves on the boards of the Sam Houston Area Council of the Boy Scouts of America and Theatre Under The Stars.

David B. Rottino is the Executive Vice President, Business Development and Chief Accounting Officer and has served in such capacity since January 2014. He previously served as Senior Vice President of Finance, Business Development and Chief Accounting Officer from July 2010 to January 2014 and from June 2008 to July 2010, Mr. Rottino served as the Senior Vice President and Chief Accounting Officer. Prior to joining the Company, Mr. Rottino served as Vice President and E&P Controller for El Paso Corporation from June 2006 to May 2008. Mr. Rottino is a Certified Public Accountant. He also serves on the Board of Camp for All.

Thomas E. Emmons is the Senior Vice President – Corporate Services and has served in such capacity since January 2014. He previously served as Vice President – Corporate Services from September 2012 to January 2014 and from August 2008 to September 2012, Mr. Emmons served as Vice President, Human Resources and Environmental, Health and Safety. Mr. Emmons joined the Company in July 2007 as Environmental, Health and Safety Director. Prior to joining the Company, Mr. Emmons served as ConocoPhillips’ EHS, Sustainable Development and Stakeholder Engagement Manager for the Gulf Coast Business Unit. Prior to that role, he served in various positions of increasing responsibility at Burlington Resources. He also serves on the Board of the Nehemiah Center in Houston.

Jamin McNeil is the Senior Vice President – Houston Division Operations and has served in such capacity since January 2014. He previously served as Vice President – Houston Division Operations from June 2007 to January 2014. Prior to joining the Company, Mr. McNeil served as ConocoPhillips’ Production Manager in the San Juan Business Unit. Prior to that role, he served in various positions of increasing responsibility at Burlington Resources. In addition, Mr. McNeil is a member of the Society of Petroleum Engineers.

Candice J. Wells is the Vice President, General Counsel and Corporate Secretary and has served in such capacity since October 2013. From March 2013 to October 2013, Ms. Wells served as Vice President, acting General Counsel and Corporate Secretary. From September 2011 to March 2013, Ms. Wells served as Vice President, Assistant General Counsel and Corporate Secretary and from August 2007 to September 2011, she served as Senior Corporate Counsel and Assistant Corporate Secretary. Ms. Wells serves on the Board of the Youth Development Center and on the advisory board for Girls Inc.