Jim Chanos is the founder and president of Kynikos Associates, the world's largest dedicated short-selling hedge fund. He formed Kynikos in 1985 and has bet against companies involved in a string of corporate meltdowns, such as Commodore International and Tyco International.

Perhaps most celebrated of all was his early bet against Enron after being puzzled by the company's accounting a year before its collapse in late 2001. But even he admits: "We didn't think it was a fraud until very much near the end of the saga."