He is Director of the Urban Health Resource Centre, that addresses the health and nutrition of 500,000 disadvantaged urban-dwellers through demonstration programmes in partnership with slum communities and government departments. He has assessed and observed urban health and wellbeing programmes in Nairobi, Ethiopia, Bangladesh and New York. He has been a member of several committees and expert groups on urban health. He is Adjunct Faculty at Johns Hopkins Bloomberg School of Public Health and in the Department of Global Health at George Washington University School of Public Health and Health Services, and has served as Guest Faculty at the University of California, Berkeley, TERI University, Indian Institute of Public Health, Delhi)