Mullen began his NHL career with the St. Louis Blues, signing as an undrafted free agent in 1979. His debut came in the 1980-81 season, and he quickly established himself as a reliable forward. Known for his scoring ability and quick release, Mullen became a consistent offensive threat. During his time with the Blues, he developed into a top-line player, leading the team in scoring in the 1983-84 season.
In 1986, Mullen was traded to the Calgary Flames, where his career reached new heights. He played a crucial role in the Flames' success, helping the team reach the Stanley Cup Finals in 1986 and ultimately winning the Cup in 1989. Mullen's performance during the 1988-89 season was exceptional, as he scored 51 goals and 110 points, earning him the Lady Byng Memorial Trophy for sportsmanship and gentlemanly conduct.
After his successful stint with the Flames, Mullen was traded to the Pittsburgh Penguins in 1990. His arrival in Pittsburgh coincided with the team's rise to prominence in the NHL. Mullen was instrumental in the Penguins' back-to-back Stanley Cup victories in 1991 and 1992. His ability to perform in high-pressure situations was evident, as he contributed significantly during the playoffs.
Mullen's tenure with the Penguins solidified his reputation as one of the league's top American-born players. He became the first American player to score 500 career goals, reaching this milestone in 1997. His scoring prowess and leadership on and off the ice earned him respect from teammates and opponents alike.
In the latter part of his career, Mullen played briefly for the Boston Bruins before retiring in 1997. Over his NHL career, he accumulated 502 goals and 561 assists for a total of 1,063 points in 1,062 games. His achievements were recognized with his induction into the Hockey Hall of Fame in 2000, making him one of the few American players to receive this honor.
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