Board of directors

Ms. Clark was chief financial officer and executive vice president of Marathon Oil Corporation from 2007 to 2013 and senior vice president and chief financial officer from 2004 to 2007. Prior to Marathon, she served as chief financial officer of Nuevo Energy Company and Santa Fe Snyder Corporation. Ms. Clark has served as a director of Dell Inc. and Exterran Holdings, Inc. She also serves as a director for EOG Resources, Inc. and the environmental nonprofit Resources for the Future.