Board of Directors

Board of Directors

Chairman of the Board
Chairman of the Board
Charles Shaver has served as a member of the Board since July 2011 and is currently our Chairman of the Board. Mr. Shaver has served as the Chairman of Axalta Coating Systems Ltd. (NYSE: AXTA), a global coatings company, since February 2013 and was previous its Chief Executive Officer from February
Director
Director
Peter Bernard has served as a member of the Board since May 2012. Mr. Bernard also has served as a member of the board of directors of RS Energy Group, a reservoir engineering and consulting business, since February 2016; as Executive Chairman of Rubicon Oilfield International, an oilfield products
Director
Director
Diane K. Duren was appointed to the Board in August 2017. In February 2017, Ms. Duren retired from Union Pacific Corporation, having served as Executive Vice President, Chief Administrative Officer and Corporate Secretary for four years, after serving as Vice President and General Manager–Chemicals
Director
Director
William J. Kacal has served as a member of the Board since January 2012. Mr. Kacal currently serves as a director of Alon USA Energy, Inc. (NYSE: ALJ), an independent refiner and marketer of petroleum products; Integrity Bancshares, Inc., located in Houston, Texas, and its wholly-owned subsidiary,
Director
Director
Bryan A. Shinn has served as our President since March 2011 and as our Chief Executive Officer and a member of the Board since January 2012. Prior to assuming this position, Mr. Shinn was our Senior Vice President of Sales and Marketing from October 2009 to February 2011. Before joining us, Mr.
Director
Director
J. Michael Stice, Ed.D. has served as a member of the Board since October 2013. Mr. Stice has served as Dean of the Mewbourne College of Earth & Energy at the University of Oklahoma since August 2015. From September 2009 until his retirement in December 2014, he served as Chief Executive Officer of