On North Michigan Avenue in Chicago, on the Magnificent Mile, sits one of the city's tallest and swankiest residential buildings. The most notable feature of the structure, a seven-year-old art deco-ish number called the Park Tower, is a two-story penthouse with a set of enormous, darkly tinted windows that give the place a Howard Hughes-like mystique. Occasionally passersby shopping at the Armani or Tiffany stores nearby catch a glimpse of the windows and tilt their heads skyward with an "I-wonder-who-lives-there?" stare.

The answer - Kenneth C. Griffin - probably wouldn't make much of an impression, which suits a secretive hedge fund manager like him just fine. In fact, he fits the hedge fund stereotype quite nicely. He's young (38), fantastically rich (worth $2 billion or so), and he collects museum-quality art (he recently spent $80 million to take a Jasper Johns off David Geffen's hands).

He's got the trophy home, obviously, and is married to a very attractive woman, the former Anne Dias. The company he founded and runs, Citadel Investment Group, has around $13 billion in assets and is one of the largest and most powerful funds in the world.

What sets him apart from his fellow nouveau zillionaires is the scale of his ambition. Griffin, say people who know him, doesn't want a reputation merely as a hedge fund legend like Tiger Management's Julian Robertson or SAC Capital's Steve Cohen. What he really seems to want is to build an edifice for the ages: a diversified, large-scale financial institution on the order of Goldman Sachs or Morgan Stanley.

To get there Griffin has launched a flurry of business deals: buying up a mortgage operation here, some distressed assets from another hedge fund there. Last fall Citadel announced plans to sell up to $2 billion in bonds - a first for a hedge fund. All the while, there's steady speculation that Citadel will go public. (Griffin declined to be interviewed for this piece in time to meet our deadline.)

The ambition doesn't stop there. Griffin seems to be going for full-blown, captain-of-industry immortality, the kind achieved by titans who didn't just dot, but shaped, the landscape of business over the past century. As a former Citadel manager put it recently, "Suddenly it seems like Ken wants to be a J.P. Morgan or John D. Rockefeller."

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