Here's what scientists know about mass school shootings
Of the 13 mass school shootings in the U.S., the three most deadly occurred in the last decade. Data from these attacks helped criminologists build a profile of the gunmen.
Jillian Peterson
Professor of Criminal Justice, Hamline University
Jillian Peterson is a forensic psychologist, associate professor of criminology and criminal Justice at Hamline University, and co-president of The Violence Project. She earned her Ph.D. in Psychology and Social Behavior from the University of California, Irvine. Peterson's areas of interest and expertise are forensic psychology, mental illness in the criminal justice system, cyber violence, school violence and mass shootings. She recently directed a large-scale research project funded by the National Institute of Justice examining the life histories of over 170 mass shooters.