Conducted studies of HIV's natural history and transmission. One of the first clinical researchers in NE to care for patients living with AIDS. Director, Brown/Tufts/Lifespan Fogarty (NIH) AIDS International Research and Training Program. Has worked increasingly in India. Participant, lecturer and presenter at regional conferences and symposia on biological and behavioral approaches to prevention research and the development of community-based clinical research. Co-edited The Emergence of AIDS: Impact on Immunology, Microbiology, and Public Health, American Public Health Association Press. Has served on Data Safety and Monitoring Board of the NIH's AIDS Clinical Trials Group. Sits on several editorial boards of scientific publications. Has co-authored more than 350 articles, chapters and other publications on AIDS and related infectious disease topics.