No. 18

Michael Tweed/Reuters/Corbis

No. 18

Marc Benioff, 44
Founder, Chief Executive, Salesforce.com

No. of Angel Investments: 9
Companies funded (a sampling): Mashery, Qik, Tapulous, Zuora

The blustery Benioff, a former Oracle sales star, is best known as CEO and lead pitchman for Salesforce.com, a maker of customer management software delivered over the Web. He was also an early investor in Siebel Systems and Blue Martini Software, and he has stakes in online physician finder ZocDoc and iPhone game maker Tapulous.