(FORTUNE Magazine) – This low-key 56-year-old possesses a simple but vitally important kind of power: the power to make money. Lewis is a new-breed CEO. He doesn't grandstand. He just quietly focuses on wringing profits out of the megabank (the third-largest commercial bank in the country by assets, behind Citigroup and J.P. Morgan) that his larger-than-life predecessor Hugh McColl created in a binge of acquisitions. BofA's stock has appreciated 51% since Lewis's arrival in April 2001. He grew earnings 23% last quarter by driving big gains in mortgage and credit card banking. And he's brilliant at sussing out what customers want (and will pay for). So what if Lewis doesn't ooze charisma? His investors like him just the way he is. --J.S.