The fields of adult development and the study of learning have traditionally been considered separate, with development falling under psychology and learning under education. However, recent ideas, research, and practices that have emerged in these fields of study effectively emphasize the inherent reciprocal relationship that exists between them: advances in development frequently lead to learning, and conversely, learning almost necessarily fuels development.In this second edition of The Oxford Handbook of Reciprocal Adult Learning and Development, the synchronicity between development and learning is explored further, as expert authors advance the latest theories to provide a rich foundation for this new area of study and practice for this interrelated field of study. At the border of two disciplines, this handbook focuses on the capacities of intelligence, meta-cognition, insight, self-efficacy, spirituality, interpersonal competence, wisdom, and other key adult attributes as they relate to positive changes and personal growth in adults. Contexts for development and learning (e.g., the work role and environment) are also addressed, and mixed in throughout the volume are emanating implications for research, practice, and policy. What emerges is a thoughtful handbook for all who promote optimal aging, and is a must-read for academics, psychologists, and practitioners in adult development.