Founder, Andreessen Horowitz
Andreessen has come a long way since selling Netscape to AOL for $4.2 billion, a move that established him as the web's first wunderkind. He subsequently co-founded two companies and invested his own money in dozens more. Last year, along with Ben Horowitz, he launched a $300 million fund so that he could make larger bets. Among them: He made a $50 million contribution to Skype, and most recently he led a $20 million round in Foursquare. --J.H.
NEXT: Investor runner-up: Reid Hoffman
Last updated July 09 2010: 1:19 PM ET