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Bill Gates and Carl Icahn may be college dropouts (Harvard and NYU, respectively), but most billionaires carry a sheepskin diploma with them. These top-tier universities have educated the most billionaires:

1. Harvard: with 50, including Steve Ballmer, Michael Bloomberg, and Sumner Redstone.

2. Stanford: was founded by a billionaire and counts 30 among alumni, including  Nike founder Phil Knight and Google's Sergey Brin and Larry Page.

3. University of Pennsylvania: 27, mostly products of its prestigious Wharton School. Alums include The Donald and SAC Capital founder Steven Cohen.

4. Yale: 19,  including Sears chair Eddie Lampert and private equity guru Stephen Schwarzman.

5. Columbia: holds 15, most notably some guy named Warren Buffet.

(Read more billionaire stories.)