This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book aims to present the reader with an extensive review of the history, guiding theoretical frameworks, current practices, research and evaluation, and ethical considerations of Adventure Therapy (AT). It explores the historical origins and evolution of AT theory and practice. The book presents a theoretical framework that supports the role of nature in AT. It outlines how adventure therapists connect positive and functional changes in adventure experiences with positive and functional changes in clients’ lives using kinesthetic metaphors. The book discusses supervision in AT, as well as specific supervision models that could be used in AT practice. It presents an overview of critical issues in AT that research and evaluation should address by asking the hard questions about process and outcomes in AT. The book examines categories of physical, psychological, and medication risks.