He is Professor of Psychiatry & Human Behavior at Brown University, Providence, U.S.A. He is Director of the Brown University Geriatric Psychiatry Training Fellowship. He is also a consultant with the World Health Organization / Pan American Health Organization with whom he has numerous ongoing projects. His research focus is psychiatric epidemiology and geriatric psychiatry. He has an interest in cultural psychiatry and international mental health. He has done research on disasters, immigration, stigma, stress, and the role of social class on mental health