Much of Jill McMahon’s life has been colored by gun violence. When McMahon was 6, she and her mother were carjacked at gunpoint. Then, “The day that Columbine happened, April 20, 1999, we were bringing our firstborn child home from the hospital,” she says. “So, as we were leaving the hospital bay, the ambulances were coming in with children that lost their life to Columbine.”