What does it mean to be a school leader when the unimaginable happens? Frank DeAngelis, retired principal of Columbine High School, knows the answer firsthand. DeAngelis has dedicated much of his time in the past 23 years since the mass shooting at Columbine High School, helping other school leaders. Today he is part of the growing number of principals, who've endured school shootings, and work together as part of the Principals Recovery Network. In this episode, he reflects on the Columbine shooting, what he has learned, and about a new guide to help other school leaders work through responding to traumatic events like shootings.