Sheryl Olson is Professor of Psychology and Research Professor in the Center for Human Growth and Development at the University of Michigan. She served as Director of Clinical Training between 2000 and 2005. She is Principal Investigator of the Michigan Longitudinal Study, a prospective longitudinal investigation of the development of self-regulation in young children at risk for school-age behavior problems. Dr Olson has received teaching and mentoring awards from the University of Michigan. Arnold Sameroff is Professor of Psychology and Research Professor in the Center for Human Growth and Development at the University of Michigan. Dr Sameroff has won major awards for his distinguished contributions to developmental science, including the G. Stanley Hall Award for Distinguished Contributions to Developmental Psychology (Divison 7, APA) and the Distinguished Scientist Award from the Society for Research in Child Development. He is the author of more than 160 publications relevant to the development of mental health across the lifespan, including a forthcoming volume on transactional development.