Anthony James "Tony O" Esposito was a Canadian-American professional ice hockey goaltender, who played 16 seasons in the National Hockey League (NHL), 15 of those for the Chicago Blackhawks. He was one of the pioneers of the now popular butterfly style. Tony was the younger brother of Phil Esposito, a centre. Both brothers had notable careers and are enshrined in the Hockey Hall of Fame. Esposito's jersey number 35 was retired by the Blackhawks in 1988.