Sydney Rosen, M.P.A., is a Research Professor in the Department of Global Health at the Boston University School of Public Health and a Co-Director of the Health Economics and Epidemiology Research Office (HE2RO) of the University of the Witwatersrand in Johannesburg, South Africa. Her research addresses the economic consequences of the HIV/AIDS epidemic and in particular the outcomes, costs, cost-effectiveness, and benefits of HIV and TB care and treatment interventions and models of service delivery. She is the principal investigator of multiple USAID-, NIH-, and foundation-supported studies and evaluations in South Africa and has worked extensively in Zambia and Kenya. She is also the author of policy and review papers on the business response to AIDS, the rationing of antiretroviral therapy, and the retention of patients in HIV/AIDS care and treatment programs. Her current projects include AMBIT, EVIDENCE, MATI, and EQUIP, all described on the BUSPH website. Professor Rosen’s technical training is in policy analysis and applied economics. She holds a BA magna cum laude from Harvard University and an MPA from the Kennedy School of Government at Harvard.