Mental health care providers are increasingly confronted with people with antisocial problems. This practice book provides tools for the treatment of people with antisocial behavior arising from personality problems. The tools are based on scientific knowledge and best practices. The book is intended for psychologists, psychiatrists, social workers and (social psychiatric) nurses working within mainstream and forensic mental health care. shows, on the basis of many examples, how the practitioner can deal with specific treatment situations and requests for help such as aggression, substance use, and suicidality. The book describes methods to help clients and their social environment change or deal with antisocial behavior better. Attention is also paid to the emotions these clients evoke in practitioners and to the question of how practitioners can deal with this effectively.