The Development of Social Engagement, edited by Peter J. Marshall and Nathan A. Fox, brings together some of the latest research on social engagement processes across a range of life stages and species. The opening chapters provide overviews of cutting-edge research on social engagement inareas such as temperament, face processing, joint attention, language development, and early social cognition in humans. Subsequent chapters address questions related to biological determinants of social systems, play, and maternal behavior across a variety of species, as well as evolutionaryissues associated with social engagement. Finally, a number of chapters examine the application of rigorous biologically focused research paradigms to the study of atypical social engagement in children. Atypical social engagement is framed in terms of disorders such as autism and WilliamsSyndrome, as well as in the effects of adverse early rearing environments such as institutions. This volume will be a valuable guide for those interested in a neurobiological approach to the study of social development. It provides an introduction to current research directions in this rapidlyexpanding field for both student and professional researchers in developmental psychology, comparative psychology, and developmental psychopathology.