His research interests are development economics, environmental economics and applied econometrics. His research focuses on how households in developing countries act to protect themselves from environmental health risks, in particular through investments and behaviours related to clean water and sanitation. His papers include studies of the effect of social interactions on investment in sanitation, the impact of micro-finance on investments in environmental health in Cambodia and Bangladesh, demand for clean water in Ghana, the impact of sanitation and clean water infrastructure on health in India, and the effect of disgust-based messaging on health behaviour in Bangladesh. Ongoing projects include a study of the impact of aresenic exposure on cognitive ability in Bangladesh and the long-term effect of in-utero exposure to floods on human capital among children, also in Bangladesh.