Sam is CEO of InterAction, the nation's largest US alliance of international non-governmental organisations. As InterAction's chief executive, Sam strengthens the impact and collective voice of the US NGO sector and leads its engagement with the UN, governments, and civil society groups around the world. He sits on the Inter-Agency Standing Committee at the UN, the Van Leer Group Foundation board, The Center for Disaster Philanthropy board and is a member of the Council on Foreign Relations. Previously, he served as chief executive officer of Plan International USA (from 1994 to 2006) and as a resident fellow at the Rockefeller Foundation's Bellagio Center (2015).
Sam holds a master's degree with distinction from the Middlebury Institute of International Studies and a bachelor's degree from the University of Vermont. As a Fulbright scholar he completed postgraduate research at the Institut Universitaire des Hautes Etudes Internationales in Geneva.