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Mikells joined ExxonMobil from Diageo plc, where she held the position of chief financial officer since 2015 and was a member of the board of directors. In this role, she was accountable for strategy, investor relations, supply chain, procurement and finance. Previously she was chief financial officer at Xerox, ADT, Nalco and United Airlines. During her time at United Airlines, she was also vice president of investor relations and treasurer. Mikells holds an MBA from the University of Chicago.