His career coaching record is 276–288–84, combined with a 233–167–53–7 career record as an NHL general manager, and he has been involved in more than 2,000 professional games in varying roles. His résumé also includes three appearances at the National Hockey League All-Star Game and two appearances (1984 and 1987) on the coaching staff of the Canada Cup-winning Team Canada. Muckler joined the Ottawa Senators as general manager in June 2001, and presided over what was arguably the team's most successful period. The team ultimately reached the Stanley Cup finals in 2007 but lost to the Anaheim Ducks in a five-game series. Despite this success, the Senators announced that Muckler had been fired on June 18, 2007. Head coach Bryan Murray was promoted to replace him. Muckler was hired as a senior advisor with the NHL's Phoenix Coyotes in September 2008.