BA in Psychology, Barnard College; MD, University of Pennsylvania; MPH, Johns Hopkins University. Expert on humanitarian issues, previously holding senior positions with the CDC and the Bill & Melinda Gates Foundation. Serves on several boards, including the Center for Strategic and International Studies, Rockefeller Foundation and Colgate-Palmolive. Member, Council on Foreign Relations. Chaired the Presidential Advisory Council on HIV/AIDS and serves on the President's Commission on White House Fellowships.