We cannot understand contemporary psychology without first researching its history. Unlike other books on the history of psychology, which are chronologically ordered, this Handbook is organized topically. It covers the history of ideas in multiple areas of the field and reviews the intellectual history behind the major topics of investigation. The evolution of psychological ideas is described alongside an analysis of their surrounding context. Readers learn how eminent psychologists draw on the context of their time and place for ideas and practices, and also how innovation in psychology is an ongoing dialogue between past, present, and anticipated future.