A mathematician and software engineer, desJardins has degrees from MIT and the University of California at Berkeley. His dissertation involved the analysis of a mathematical game, with applications to information theory. He was among the first 20 employees at Google, where he worked from 1999 to 2005. Since leaving Google, desJardins continues to engage with mathematical research and has been a private investor, an active philanthropist, and a supporter of many progressive groups and organizations. David and his wife Nancy Blachman are founders of the Julia Robinson Mathematics Festival, a program of math education and enrichment for middle and high school students; and desJardins is a trustee of the University of California Berkeley Foundation, and a member of the MIT Corporation, the Institute’s board of trustees. He has been a member of the Democracy Alliance, an organization of progressive donors and movement leaders, since 2005.