In 2017 , Densley launched The Violence Project with psychologist Jillian Peterson of Hamline University . Densley and Peterson built a database of all public mass shooters since 1966 coded according to 50 different variables . Their research on mass shooters included in-depth analysis of K-12 school shootings and how the Columbine High School massacre became a blueprint for future school shootings . Densley and Peterson are critical of active shooter lockdown drills in schools for traumatizing young children and normalizing school violence
Columbine High School massacre
Columbine High School massacre
James Densley