This book examines the current research in gene-environment transactions (GEX) and its potential use in developing interventions and applications tailored to individual genetic makeups. Key concepts underlying GEX studies in this area are defined, identifying fundamental challenges in devising informed research questions and conducting valid and useful experiments. Chapters analyze GEX models inspired by the present day genome-based frameworks, particularly in terms of advances in identifying and understanding complex environmental factors, using examples from common psychological conditions, such as antisocial behavior, chronic physical aggression, and chronic internalizing disorder. In addition, the book presents new and potential applications of the framework in the contexts of prevention science and intervention research.  Topics featured in this book include: Epigenetics and the biology of gene x environment interactions. Gene by environment interactions and its potential use for intervention strategies in anxiety disorders. The challenges and potential for research on gene-environment interactions within autism spectrum disorder. Using genetically informed prevention trials to test gene x environment hypothese. Challenges for intervention research within the GEX framework. Gene-Environment Transactions in Developmental Psychopathology is a must-have resource for researchers/professors, clinicians, and related professionals as well as graduate students in developmental psychology, psychiatry, human genetics, and related disciplines.