After acquiring MD. from Kochi Medical School in 1985, I worked for children with disability. I acquired Masters in Tropical Paediatrics from Liverpool School of Tropical Medicine in 1995, with the dissertation “ Pneumocystis Pneumonia in HIV infected children in Malawi”, and Ph.D. from Faculty of Medicine, University of Liverpool in 2002 with the thesis “Epidemiology and microbiology of acute respiratory infections in children in an urban poor area in Nairobi, Kenya and molecular epidemiology of RS virus”. I joined vaccine trials for pertussis and measles in Ghana. I worked for humanitarian assistance in the former Yugoslavia, the former Zaire, Iraq, Afghanistan, Honduras and South Sudan with AMDA, Peace Wind Japan, UNHCR, and UNICEF. I have consulted and coordinated on community health, health system strengthening, epidemiology on infectious diseases and NCD in Sri Lanka, Kenya, Ghana, Fiji and Philippines and for local capacity development for health system research and epidemiology.