Craig Silverstein and wife signed Giving Pledge; they believe in "shaping philanthropy to fit lifestyle," which in their case includes still working regular jobs.
"Signers of The Giving Pledge provide a statement about their philanthropy, which appears on the website. Among recent signatories, the most illuminating statement by far comes from Craig Silverstein and Mary Obelnicki. Mr. Silverstein is often called 'Google's first hire' because he joined co-founder Larry Page and Sergey Brin when they were still a start-up, operating out of a rented garage. Silverstein left Google in 2012 but continues to work, as does his wife Mary Obelnicki, who is a software developer. Although the couple are members of the rare few who are both willing and able to give away a half-billion-dollar fortune, their statement reveals approaches to charitable giving that everyone might adopt to become more savvy givers." -- Mark V. Ewert, theFool.com