High Quality Content by WIKIPEDIA articles! John Muckler (born April 3, 1934) is a professional hockey coach and executive, most recently serving as the general manager of the Ottawa Senators of the NHL. Muckler has over 50 years of professional hockey experience as a part owner, general manager, director of player personnel, director of hockey operations, head coach, assistant coach and player. He has been a part of five Stanley Cup championships in various roles.