Arnold Sameroff is a developmental psychologist who pioneered the field of developmental psychopathology. Currently he is Professor Emeritus of Psychology at the University of Michigan. Dr. Sameroff is best known for developing the 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. He has published numerous research articles and 12 books, most recently The Transactional Model of Development: How Children and Contexts Shape Each Other. Among his honors are the Distinguished Scientific Contributions Award from the Society for Research in Child Development and the G. Stanley Hall Award from the Developmental Division of the American Psychological Association. He 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.