Richard K. Davidson, 70, former CEO and chairman of Union Pacific Corp. Director since 2006; up for re-election this year.
Burns Hargis, 66, president of Oklahoma State University; also on the board of BOK Financial. Director since 2008; up for re-election this year.
Don Nickles, 63, former U.S. senator; founder and president of The Nickles Group, a Washington, D.C., consulting firm. Director since 2005.
Kathleen M. Eisbrenner, 51, founder and CEO of Next Decade, a company that creates new opportunities in the integrated international liquefied natural gas industry. Director since 2010.
Louis A. Simpson, 75, chairman of SQ Advisors LLC; former president and CEO of GEICO Corp. Director since 2011.
Frank Keating, 68, former Oklahoma governor; president and CEO of American Bankers Association. Director since 2003.
Merrill A. “Pete” Miller Jr., 61, chairman president and CEO of National Oilwell Varco Inc. Director since 2007.
Charles T. Maxwell, 80, senior energy analyst with Weeden & Co. Director since 2002.