Dr. Sameroff is a developmental psychologist and pioneer in the field of developmental psychopathology. He is best known for his influential transactional model of development, which describes the ways in which the child, parent, and environment affect each other and the child's development. His research on environmental risk and promotive factors has fostered a more comprehensive understanding of interventions to improve the emotional, social, and cognitive welfare of children. Dr. Sameroff is a former president of the Society for Research in Child Development, the Developmental Division of the American Psychological Association, and the International Society for Infant Studies.