Suzy Dalton Sonenberg served as Executive Director of the Long Island Community Foundation from March 1988 to December 2009. Prior to joining the Foundation, Ms. Sonenberg was Program Officer at the New York Foundation, a mid-sized private foundation that makes grants in New York City to its most disadvantaged neighborhoods. After receiving a master's degree in Social Work from Adelphi University in 1976, Ms. Sonenberg spent eight years as a nonprofit administrator in Manhattan before joining the funding community in 1984. She has taught social policy on both the graduate and undergraduate levels at the Adelphi University School of Social Work, and in 2009 was awarded an honorary doctorate by the University.

 Ms. Sonenberg is the founder of LITAC Nonprofit Solutions, a founder of the Long Island Fund for Women & Girls, and a founding board member of Sustainable Long Island. She currently serves on the board of the Community Training and Assistance Center based in Boston. Together with Elaine Gross, she is also a co-founder of ERASE Racism.