Hadar Susskind is widely acknowledged as one of the Jewish community’s leading progressive advocacy voices on both foreign and domestic policy. He has built strong relationships with members of Congress, administration officials, and progressive partners and allies from across the spectrum of American political life. 

Hadar has served as a senior professional leader at the Council on Foundations, Bend the Arc Jewish Action, the Tides Foundation, J Street, and the Jewish Council of Public Affairs.

Hadar currently serves on the board of the Congressional Progressive Caucus Center. He has also served on the White House Office of Faith Based and Neighborhood Initiatives Task Force on the Environment, as well as the Board of Directors of the Coalition on Human Needs, the Public Policy Committee of Independent Sector, the Leadership Council of Nonprofit VOTE, and the board of Ameinu. In both 2024 and 2025, Washingtonian Magazine named him as one of Washington’s 500 Most Influential People.  

Hadar is a graduate of the University of Maryland and holds the rank of Sergeant First Class in the Israel Defense Forces.