Book excerpt: This brief investigates school shootings and their impact on individual, community, and societal levels. It includes professional and personal perspectives from individuals directly involved in and impacted by school shootings. These novel perspectives will help inform best practices necessary to strengthen school safety measures, as well as prevention and response efforts. This brief will serve as helpful guide to mental health professionals, school administrators, psychology students and educators, law enforcement, and threat management and crisis response teams, aiding in better understanding of the many factors surrounding school shootings.