The Analysis: The Wizard of Aon

When Gregory Case, a longtime McKinsey & Co. consultant, told friends he was joining beleaguered insurer Aon Corp. as chief executive officer in the spring of 2005, some said he was crazy. Now, Aon has resolved its regulatory headaches. Staffers, under Case's direction, have more than made up the lost revenues at the now $7.5 billion-a-year outfit, turning it into the nation's biggest insurance broker. And investors have responded warmly, boosting the stock to an all-time high last fall above $51 a share.

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