This important book offers a comprehensive review of over 70 years of transactional analysis psychotherapy from within the field, considering its historical context and various applications, as well as how different aspects of the theory emerged and how they are applied. The book examines the structure of transactional analysis, taking readers on a journey from the inception of the method to present-day applications of the theory. The authors raise questions around the way the theory may be taught as doctrine and ask readers to consider how new aspects of theory are fully integrated into the already existing schema. The authors also highlight the zeitgeist within which TA was developed and offer reflections as to how further developments are also part of a particular spirit and mood of the times in which they were developed. A Living History of Transactional Analysis Psychotherapy offers coherence between different aspects of TA theory and when, where, and why they are used, making it important reading for TA scholars, students, and practitioners.