John Canning Jr.
Founder and chairman, Madison Dearborn Partners
In Chicago, “Canning” and power go together as surely as hot dogs and mustard. Not only does he oversee the largest private equity firm in the city, but he’s got his finger in a zillion pies, from Exelon (he’s a director) to the Museum of Science and Industry (he’s chairman). He made an unsuccessful bid for the Cubs in 2008. If the Ricketts make good on their vow to sell a 20 percent stake in the team, could Canning be the one to gobble it up?