"The Psychology of Extreme Violence investigates the motivational drivers of those guilty of lone-actor terrorism, school shootings, and serial murder. Through a diverse set of case studies, their mobilisation toward violence is engagingly demonstrated. Collectively, it leaves us with a number of lessons learned for risk assessment and management purposes." —Paul Gill, Professor of Security and Crime Science, University College London, UK"Extreme killers are often analyzed in overly simplistic terms: either they were mentally ill, or they weren't. Fortunately, Allely brings a more nuanced approach by analyzing how neurological factors, mental disorders, psychological tendencies, environmental variables, and more can interact to produce serial killers, terrorists, and mass shooters. In applied case studies, she then demonstrates how the lives of perpetrators spiral out of control—before they take the lives of others."— Adam Lankford, University of Alabama, USA