Gidi Grinstein is the President and Founder of the Reut Institute, a non-partisan, non-profit strategy group that aims to sustain significant and substantive impact on Israel and the Jewish World under the banner of 21st Century Zionism. Reut catalyzes deep transformations in the underlying values and mindset of different actors to address critical challenges to national-security, socioeconomic development, and the Jewish World. Specifically, Reut specializes in identifying critical gaps, creating new knowledge, offering an innovative and exciting vision, and successfully catalyzing its systemic integration. In March 2010, it was described as "one of the premier Israeli policy research centers" by New York Times columnist Thomas Friedman.
Before founding Reut, Grinstein served as Secretary and Coordinator of the Israeli negotiation team on the Permanent Status Agreement between Israel and the Palestine Liberation Organization in the Office and later in the Bureau of Prime Minister Ehud Barak (1999–2001). He was the youngest member of the Israel delegation at the time. On the night of July 17–18, 2000, at the 2000 Camp David Summit, he used the Heimlich maneuver to dislodge a peanut from Barak's throat.
In addition, he was the founder of Yesodot Group for reforming Israeli Governance, a member of Kol-Dor Group for global Jewish peoplehood, a member of "Israel 2025 – Scenarios for Future Developments," and a founding member of a group that worked to realize the vision of the "Birthright Israel" program.
Grinstein is a graduate of Tel-Aviv University in Economics (1991) and Law (1999) and of Harvard University's John F. Kennedy School of Government as a Wexner Israel Fellow (2002). He is a Captain (Res.) in the Israeli Navy and a former volunteer police officer. In 2013, Grinstein published his first book: "Flexigidity: The Secret of Jewish Adaptability & Challenge and Opportunity Facing Israel."
- "Sanctuary Shabbat Service with Guest Speaker Gidi Grinstein". Park Avenue Synagogue. Retrieved 3 January 2014.
- L. FRIEDMAN, THOMAS (March 16, 2010). "Let’s Fight Over a Big Plan". NYTimes. Retrieved 3 January 2014.
- "Rethinking the ‘secret sauce’ behind Jewish survival". The Times of Israel. Retrieved 3 January 2014.
- Martin Indyk, Innocent Abroad (New York: Simon & Schuster, 2009), pages 320–321.
- "Gidi Grinstein". Jewish Federations of North America. Retrieved 3 January 2014.