J. Todd Mitchell, 50, joined the board of directors in 2002. Mitchell serves as president of Walton Mitchell & Co., Inc., a private energy investment company. Mitchell served as president of GPM Inc., a family-owned investment company, from 1998 to 2006, and as vice president for strategic planning from 2006 to 2007. He was on the board of directors of Mitchell Energy & Development Corp. from 1993 to 2002.