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William Foster

Partner, Head of Consulting Practice, Bridgespan Group


William Foster is a Bridgespan partner, head of the consulting practice, and active thought leader on issues of social change.

Since joining the firm in 2002, William has supported the success of some of the sector’s most innovative philanthropies (e.g., Blue Meridian Partners and Co-Impact) and some of the highest impact nonprofits (e.g., Youth Villages and Anti-Defamation League). He has a particular focus on the diligence, structuring and supports required for philanthropic “Big Bets” and strong funding models for nonprofits. William has helped his foundation clients and a number of individual donors to craft some of the largest gifts in the sector.

William has served as the executive director of the Jacobson Family Foundation, an outcomes-oriented funder making grants to support educational excellence, equality, and Jewish continuity in the United States and Israel.
Prior to joining Bridgespan, William worked at Bain & Co. He received his BA from Harvard College and his MBA from Stanford University where he was an Arjay Miller Scholar. William is active in the Jewish community, serving on the board of Gann Academy. He lives outside of Boston with his wife Rachel and their four wonderful children.