DENVER—School shootings are nothing new to Patrick Neville. While a student at Columbine High School, Neville watched 12 of his classmates and one teacher lose their lives. “From that point on, I kind of wanted to make a difference,” Neville said. After joining the U.S. Army, Neville ran for the Colorado House of Representatives, where he currently serves as the minority leader of the House.

In the video above, Neville shares his story of surviving Columbine, and how he says we can prevent more mass shootings.