Michael Gerard Hagerty (May 10, 1954 – May 5, 2022) was an American actor. He was known for playing comedic blue-collar workers, including his recurring roles as Mr. Treeger, the building superintendent, on Friends and the manager of a muffler shop on HBO's Lucky Louie.
Hagerty was born in Chicago, Illinois, on May 10, 1954. His family was Irish Catholic, and his father worked as a police officer. Hagerty completed his primary education at St. Cajetan Elementary School in 1968, before attending Marist High School in his hometown. He then studied at the University of Illinois at Chicago, where he took acting classes. Before becoming an actor, Hagerty worked at a restaurant in Evergreen Plaza and a Shell gas station and repair shop on Western Avenue.
Hagerty started acting after being invited by Jim Belushi to join the improv group The Second City. He went on to co-write and co-star in three revues on the troupe's mainstage during the 1980s (Also Available in Paperback — A Retrospective, Orwell That Ends Well, and True Midwest, or No, But I Saw the Movie). He also introduced the lyrics of "Bear Down, Chicago Bears" to its cast and had them memorize and sing the song. He subsequently began acting in films and television shows, beginning with Doctor Detroit in 1983. Hagerty became known for his mustache and thick Chicago accent.

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