His research, teaching and public engagement focuses on improved methods for the analysis and design of nutrition policy, tools for the scaling up nutrition interventions and the application of implementation science to nutrition. He has conducted or supervised research and project work in Ethiopia, Kenya, Tanzania, Malawi, Lesotho, Nigeria, Indonesia, China, Bolivia, Guatemala, Peru and Haiti. He has consulted on nutrition strategy development with the World Bank, USAID, UNICEF, WHO, the Bill and Melinda Gates Foundation, the Academy for Educational Development and the International Food Policy Research Institute. His most recent projects include the Mainstreaming Nutrition Initiative, the Micronutrient Program Assessment Project and the scaling up of an iron-folic acid supplementation strategy in Haiti.