My research focuses on improving through nutritional means the health and survival of infants, children, adolescents and women of reproductive age in underserved populations, with special interests in the assessment and prevention of micronutrient deficiencies, with a focus on vitamin A and E deficiencies, poor growth and protein-energy malnutrition. Most of my research has involved the conduct of population-based epidemiologic studies and intervention trials, particularly in Indonesia, Nepal (founding the Nepal Nutrition Intervention Project-Sarlahi, or NNIPS, in 1988) and Bangladesh (co-founding the JiVitA Project in 2000). In recent years, my work has broadened to explore effects of developmental nutrition exposures on health later in life and plasma proteomics as a platform for nutritional assessment.