Graças leads the largest deep-water oil producer in the world, with $146 billion in revenue, 84,000 employees and production of some 2.6 million barrels of oil per day. Though global economic conditions have hurt the stock (return is down 8% since Foster took the helm in February 2012), the company lifer is working hard to shore up Petrobras' future: She's unveiled a plan to invest $236.5 billion over five years, and she's launched an initiative to more than double oil output to 5.7 million barrels a day by 2020.
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