John Leonard was an American football player known for his role as a defensive tackle. He played in the National Football League (NFL) during the 1970s. Leonard was recognized for his strong defensive skills and ability to disrupt opposing offenses. After his playing career, Leonard transitioned into coaching, where he contributed to the development of young athletes. His experience in the NFL allowed him to share valuable insights and techniques with players at various levels, helping to shape the future of the sport.