Eric Schmidt, 54

Chief executive, Google
Investments (a sampling): Citizen Effect, CX, iShake, PublishOne, Sendmail

A veteran of tech giants Sun Microsystems and Novell, Schmidt became Google’s CEO three years before it went public in 2004. His angel investing history predates Google; in the 1990s, he placed bets on e-mail software maker Sendmail and Hipbone, a customer service software company that was later acquired. Lately, his investments have ranged from intern-posting site Intern to Giiv, a service for sending money and gifts via mobile text messages.