A comprehensive guide to the work of Jacob Robert Kantor, and a must-have for anyone interested in behaviour analysis or cognitive behavioural science. Often overlooked or misunderstood, the work of American psychologist Jacob Robert Kantor is finally being recognized for its contribution to contextual behaviour sciences. This important volume brings Kantor's prescient work into the twenty-first century, teaching readers the foundations and unique features of interbehaviorism in a straightforward way and exploring the profound effects it has in applied domains like perspective-taking, feelings and emotions, interpersonal relationships, and more. In this volume, you'll find detailed explanations of Kantor's theory, as well as its research assumptions and foundations. Whether you're a behaviour therapist, contextual behaviour scientist, behaviour analyst, student of behaviour analysis, or simply interested in the history of interbehaviorism and its modern applications, this book is an essential addition to your professional library.