Who’s responsible for preventing school shootings? ‘We’re all on duty.’

Expert Peter Langman is convinced that preventing school shootings is possible – and that we all have a part to play.

School shootings are preventable, experts say.

That sentence may sting in the wake of the May 24 massacre in Uvalde, Texas. Yet that’s the message shared by Peter Langman, a psychologist, trainer, and author who has spent years studying the perpetrators of these tragedies and how to prevent them.

“We’re all on duty,” says Dr. Langman, who serves as a researcher for the National Threat Assessment Center of the...