David is a private investor, an active philanthropist, and a supporter of many progressive groups and organizations. A mathematician and software engineer with degrees from MIT and UC Berkeley, David was employee #25 at Google, where he worked from 1999 to 2005. Since leaving Google, David continues to engage in mathematical research. David is a member of the MIT Corporation and a trustee of the University of California Berkeley Foundation. He also co-founded the Scholars Strategy Network, an association of academics and researchers engaged in policy-relevant research, and the Julia Robinson Mathematics Festival, a program of math education and enrichment for middle and high school students.