Rex Tillerson -- Secretary of State
President-elect
Donald Trump tweeted his appointment of ExxonMobil CEO Rex Tillerson as secretary of state. Tillerson, 64, has worked for Exxon for nearly 40 years and been the chairman and chief executive officer of ExxonMobil since January 2006. In this file photo, Tillerson testifies before a Senate Finance Committee hearing on rising energy prices and oil and gas tax incentives in Washington on May 12, 2011. Photo by Kevin Dietsch/UPI