Clark "Jethro" Gillies (born April 7, 1954, Moose Jaw, Saskatchewan) is a retired professional player and is a member of the Hockey Hall of Fame. He provided both physical presence and offensive punch for the NHL's New York Islanders during their four-year run as Stanley Cup champions. In a career that spanned 958 games, Gillies notched 319 goals, 378 assists, and 1023 penalty minutes.