JPMorgan Chase has handed a new job to a top banker who is seen as a possible successor to its legendary, 69-year-old boss Jamie Dimon.Marianne Lake — the 55-year-old head of the financial giant’s consumer and community banking units — has been tapped to run JPMorgan’s strategic growth office as well as its overseas consumer business, a source close to the bank’s leadership confirmed.In a memo to staffers, CEO Dimon and president Daniel Pinto wrote that Lake “will continue to build on the achievements of th ...