The Handbook of Peer Tutoring is the authoritative resource on the emerging interdisciplinary field of peer tutoring in higher education. Addressing the multiple audiences of undergraduate tutors in advanced trainings, students immersing themselves in the research of learning and writing centers, professionals seeking to understand the history and current state of the field, and researchers specializing in peer-led learning, the book gathers in one volume the voices that define the current state of the field. In doing so, it brings authors and ideas from previously discrete areas of study (learning centers, writing centers, the scholarship of teaching & learning, communication, composition, developmental education, psychology, and others) into conversation with one another, and advances the case for a single, shared scholarship of post-secondary peer tutoring that spans numerous disciplines, professional communities, and continents. Each contribution establishes the state of the research with a respect to a specific question or topic, and proposes directions for future research. Collectively, the volume both synthesizes and advances the state of the field, while also providing a roadmap for its future growth.