Exxon Mobil will promote insider Darren Woods to chairman and CEO, replacing Rex Tillerson, who is leaving the oil giant after President-elect Donald Trump picked him to become secretary of state.

Woods, 51, has been with Exxon for nearly a quarter-century. He rose through Exxon's refinery and chemicals businesses and emerged as Tillerson's likely successor a year ago, when he was named president and joined the board of directors.