Cory Schlesinger teaches computer-aided design, drafting, and vocational education classes at Allen Park High School in Allen Park, Michigan. But every one of the 120 students in his classes is well aware that Cory is a retired NFL fullback who played twelve seasons with the Detroit Lions. His nickname then was the “Sledge,” a player who blocked his opponents and brought them down like a sledge hammer. In fact, Cory was famous for destroying his face masks—sometimes as many as twenty in a season— in the game’s violent contact.

Despite this reputation, this mild-mannered hammer has a great heart, caring for his two young daughters, patiently instructing his students, conducting a school-wide strength and conditioning program for both boys and girls, and donating his time to charitable events organized by the Lions. “Cory’s such a generous, kind and wonderful person,” described Janet Wasko, principal of Allen Park High, in an article by columnist Mike O’Hara published on the Detroit Lions website January 11, 2013. “He doesn’t stand on ceremony, but everyone knows who he is. He cares about the whole student body. It’s not just about football,” she said.

Cory Schlesinger: the sledge hammer that became a true chalkboard champion.