It’s been twenty years since the April 20 shootings at Columbine High School near Littleton, Colorado. Since then, many changes have been made, but mass shootings, both in and out of schools, are still on the rise. Have Americans failed to learn anything from Columbine?

Columbine, 20 Years Later and Beyond: Lessons from Tragedy argues otherwise. Publishing in January 2019, this powerful retrospective analysis of the aftermath of the 1999 Columbine High School shooting considers society’s response to the attack, the long-term implications of the shooting, and the ways in which research and related policy must continue to move forward.

Authors Jaclyn Schildkraut and Glenn Muschert, both experts on mass shootings, share their broad understanding of this tragedy and its aftermath. The foreword is by Frank DeAngelis, principal of Columbine High School during the 1999 tragedy.

Columbine became the measuring stick against which all other mass shootings would be compared, and this book details with great sensitivity the ensuing changes to school security, law enforcement’s response to active shooter situations, threat assessment practices, legislative efforts, and media coverage of unfolding situations. With delicacy and tact, Schildkraut and Muschert help to answer the painful question raised by a stone on the wall of the Columbine Memorial: “What have we learned?”