The appointment signals a shift in Exxon to hire outsiders for senior roles after activist investors won three seats last year on the U.S. producer's board. Exxon last year hired Kathryn Mikells from drinks maker Diageo Plc as its finance chief.
In December, Ammann abruptly left the Detroit automaker where he was chief executive of its self-driving car subsidiary Cruise. Prior to running Cruise, Ammann served as the Detroit company’s president and chief financial officer, and was a Wall Street banker with Morgan Stanley before that.
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