This important volume presents a definitive review of the origins and implications of developmental psychopathology and what has been learned about the phenomenon of psychosocial resilience in diverse populations at risk. Chapters by distinguished investigators in clinical psychology, psychiatry, and child development, many of whose work led to the new developmental model of psychopathology, provide a unique review of current research on vulnerability and resistance to disorder spanning from infancy to adulthood. The volume is a tribute to Professor Norman Garmezy, a pioneer in developmental psychopathology and a renowned researcher of resilience in children at risk. Highlighted throughout the volume is Professor Garmezy’s theme that it is as important to understand successful outcomes as it is to study pathology in the search for better treatments and the prevention of developmental behavioural problems.