Marathon Oil Corporation announced that Lee Tillman has been appointed by the Company’s board of directors as chairman of Marathon Oil Corporation, effective February 1. Tillman will continue to serve as president and CEO, a position he’s held since 2013. He succeeds Dennis Reilley, who has elected to retire after nearly six years as chairman and more than 17 years on the Marathon Oil board of directors. The Company also announced that the board has appointed Gregory Boyce as its lead independent director, effective Feb. 1. Boyce has been a director of the Company since 2008.