There was a JPMorgan Chase before Jamie Dimon, but it was a shadow of its current self. Since he took over as CEO in 2006, the bank’s assets have risen nearly 110%, while earnings have nearly tripled. Dimon’s actions during the financial crisis were a master class in risk management, and his firm is now the undisputed biggest bank in the nation, with no sign of giving up that title. Just days after the President was elected, his transition team zeroed in on Dimon as the best choice for Treasury Secretary—an idea with support on both sides of the aisle. Dimon said no, however, and he now looks poised to lead by showing what a huge, well-managed bank can accomplish under a laissez-faire government.