London—John Micklethwait has been promoted to editor in chief of The Economist, from U.S. editor of the British weekly. Micklethwait joined The Economist in 1987 as a financial reporter. He set up the magazine’s Los Angeles bureau, where he worked from 1990 to 1993. He served as New York bureau chief before becoming the London-based U.S. editor. He suceeds Bill Emmott, who stepped down in February.