No. 16

Dave Duffield, 69
Founder, Chief Executive, Workday

No. of Angel Investments: 18
Companies funded (a sampling): Acta Technology, Bridgestream, Netcentives

Duffield is best known for founding human resources software company PeopleSoft in 1987, which he managed with a folksy style. In 2005 he started online business software company Workday. Duffield has been attracted to startups with an HR bent—he has invested in HireRight and Guru.com, among others. Duffield was also an angel investor in GrandCentral Communications, which was acquired by Google and is the basis for the company’s Google Voice service.

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