No. 14

Robyn Twomey/Corbis Outline

No. 14

Bill Joy, 55
Partner, Kleiner Perkins Caufield & Byers

No. of Angel Investments: 24
Companies funded (a sampling): Blazent, NeoPath Networks, Dantz

Bill Joy helped start Sun Microsystems in the early 1980s and worked there as chief scientist until 2003. These days, he’s an investor at venture capital heavyweight Kleiner Perkins. Many of his angel investments have been in business technology companies, including Brocade Communications Systems, Fortify Software, Brightmail, and Sendmail. But Joy was also an early investor in Tapulous, maker of the popular iPhone game Tap Tap Revenge.