Aaron Levie

CEO, Cofounder, Box

Beware college dropouts wielding big software ideas. Aaron Levie left the University of Southern California in 2005 to create Box, an intuitive cloud-based storage platform that's now competing against IBM and Microsoft and winning clients such as Coca-Cola, Dell, and P&G, and boasts more than 600 employees and multi-billion dollar revenue. His Twitter feed is arguably the most amusing of any CEO.