Sydney Rosen, M.P.A., is a Research Professor in the Department of Global Health and the Center for Global Health & Development of the Boston University School of Public Health and the co-director of the Health Economics and Epidemiology Research Office (HE2RO) of the Wits Health Consortium at the University of the Witwatersrand in Johannesburg, South Africa. In collaboration with HE2RO and colleagues at BUSPH, she leads an interdisciplinary team that is carrying out a set of studies on the effectiveness, costs, and benefits of HIV/AIDS care and treatment interventions. She has also worked on other applied economics projects at the Center, including research on the economics of tuberculosis, antimicrobial resistance, malaria prevention and treatment, and air pollution. Her technical training is in public policy analysis and applied economics. She came to the Center in 2001 from the Health Office of the former Harvard Institute for International Development (HIID). Before joining the staff of the Health Office, she managed a set of HIID environmental policy projects in the former Soviet Union. She is also the co-founder and former executive director of WorldTeach, Inc., a nonprofit organization that places volunteer teachers in developing countries. She holds a B.A. from Harvard University and a master’s degree from the Kennedy School of Government at Harvard.