Sarah Lerner is painfully familiar with how teachers in Uvalde, Texas must have felt as a gunman attacked their elementary school and fatally shot 21 people on May 24. In 2018, Lerner kept 15 students safe in her classroom at Marjory Stoneman Douglas High School in Parkland, Fla., while a teenager armed with an AR-15-style rifle shot and killed 17 people on the campus.

“We get into education because we love children, we love our subject matter, and we love teaching.