This completely new and updated issue takes a focused look at addiction psychiatry in three sections: Diagnostics, Therapeutics, and New Directions. Dr. Danovitch, from Cedars-Sinai and Dr. Mariani from Columbia hone in on the most rapidly advancing and relevant areas of addiction for practitioners today, from defining addiction (implications of DSM-V), to genetics and neurobiology, to specific treatment options for a variety of patient populations: for pregnant women, adolescents, and patients suffering from chronic pain, for example. A variety of addiction types are discussed (ie, opioid, stimulant, and cannabis). The issue closes with discussions of emerging trends, systems of care, investigational therapeutics and the role of the criminal justice system.