Sheryl Olson, Ph.D. Research Professor, CHGD; Professor of Psychology, LS &A Sheryl Olson is a developmental psychopathologist studying developmental and social factors in early childhood that lead to chronic behavioral disturbance. Olson directs a large longitudinal project of the development of self-regulation in 3 year-olds who manifest high levels of aggressive/disruptive behavior. Impulsive, aggressive behavior is a normal characteristic of preschool children that dissipates during middle childhood as they develop more advanced self-regulation abilities. However, many young children with behavioral self-regulation problems show continuity of aggressive behavior into the school-age years and beyond. This project will try to identify the developmental and ecological risk factors that differentiate children who show stability of behavior problems from those who have externalizing problems early but not later with specific attention to gender differences.