This collection presents a diverse set of case studies and theoretical reflections on how criminologists engage with practitioners and policy makers while undertaking research. The contributions to this volume highlight both the challenges and opportunities associated with doing criminological research in a reflexive and collaborative manner. They further examine the ethical and practical implications of the ‘impact’ agenda in the higher education sector with respect to the production and the dissemination of criminological knowledge.  Developed to serve as an internationally accessible reference volume for scholars, practitioners and postgraduate criminology students, this book responds to the awareness that criminology as a discipline increasingly encompasses not only the study of crime, but also the agencies, process and structures that regulate it. Key questions include: How can criminal justice policy be studied as part of the field of criminology? How do we account for our own roles as researchers who are a part of the policy process? What factors and dynamics influence, hinder and facilitate ‘good policy’?