Marianne Lake

London native Lake, trained in physics, has held the CFO post at J.P. Morgan Chase for nearly three years now, overseeing a balance sheet with $2.4 trillion in assets. She is one of two women, including Erdoes, on the bank’s 10-person operating committee. Lake stepped into the spotlight this past summer when CEO Jamie Dimon announced that she would be taking on a bigger role on earnings calls.