- Lost his English accent after he joined the U.S. Army.
- After Frasier (1993) ended, Mahoney claims he was approached for other TV series offers, but declined. Citing that Frasier (1993) comfortably gave him enough money, he wanted to return to the theater, which he considers his home.
- Did not start acting until he was 37 years old.
- He was formerly an English professor who taught at many colleges.
- Although he later played Frasier's father Martin Crane on Frasier (1993), John Mahoney appeared on a 1992 episode of Cheers (1982) as a pianist who was hired to write a jingle for the bar.
- Best known by the public for his starring role as Martin Crane on Frasier (1993). He was only 15 years older than Kelsey Grammer when he played his father.
- Came to the United States to visit his sister who was a war bride
- Having wrapped up Frasier (1993), he returned to Chicago to play Tom Garrison in Steppenwolf Theatre Company's "I Never Sang for My Father." Mahoney is an ensemble member of Steppenwolf. (May 2004)
- His favourite episode of Frasier was season one's 'Travels with Martin'.
- He and David Hyde Pierce were godfather to Jane Leeves' son Finn.
- Became famous for playing father to Kelsey Grammer and David Hyde Pierce on Frasier (1993). Grammer was also known for playing "Sideshow Bob" on The Simpsons (1989). Pierce would go on to play Sideshow Bob's brother "Cecil" on The Simpsons (1989) and then, to complete the joke, Mahoney played their father, again.
- While approaching middle age, he finally decided to become an actor by quitting his job as a medical journalist and enrolling in acting classes at the St. Nicholas Theater, which has since closed.
- Continued to live full time in Chicago upon establishing himself as a Hollywood film/TV and New York stage actor. He was uncomfortable living among LA's film/TV industry culture, and preferred the anonymity afforded him by continuing to live in Chicago.
- Met actor John Malkovich in a Chicago acting class, who encouraged him to join the Steppenwolf theatre company.
- Has appeared in episodes of three different series with Ted Danson: Cheers (1982), Frasier (1993) and Becker (1998).
- He joined the Army after he moved to the U.S. Once out of the service, he earned a Bachelor of Arts degree from Quincy College and a Master of Arts degree in English from Western Illinois University.
- Was a member of the Stretford Civic Theatre in Manchester, England in his teens.
- Received a bachelor of arts degree from Quincy College (Quincy, Illinois, now Quincy University) and a masters in English from Western Illinois University (Macomb, Illinois).
- Despite his character on Frasier (1993-2004) having little interest in anything cultured, he was very fond of wine, opera and the theater in real life.
- Won Broadway's 1986 Tony Award as Best Actor (Featured Role - Play) for The House of Blue Leaves (1987).
- He didn't want to uproot his life in Chicago and so commuted from there to Los Angeles while filming Frasier (1993-2004), citing it as the only negative part of filming the series.
- He joined the ensemble at Steppenwolf Theatre in 1979 and has appeared in over 20 productions there, including "The Dresser," "I Never Sang For My Father," "The Drawer Boy," "Balm in Gilead," "Orphans," "Of Mice and Men," "Born Yesterday," "The Song of Jacob Zulu," "Death and the Maiden." "Supple in Combat," and "The Man Who Came to Dinner". He made his Steppenwolf directing debut in 1994 with "Talking Heads".
- Lived in Oak Park, Illinois. (May 2003)
- He was nominated for a 1980 Joseph Jefferson Award for Actor in a Supporting Role for his performance in "Death of a Salesman" at the Steppenwolf Theatre Company in Chicago, Illinois.
- He was nominated for the 2011 Equity Joseph Jefferson Award for Actor in a Principal Role in a Play for "The Outgoing Tide" at the Northlight Theatre in Chicago, Illinois.
- He was nominated for a 1989 Joseph Jefferson Award for Actor in a Principal Role for "After the Fall" at the National Jewish Theater in Chicago, Illinois.
- Playing 'Sir' in "The Dresser" at Steppenwolf Theatre Company in Chicago (November 2004)
- Is the uncle of Illinois State Senator John Sullivan.
- In Dreamworks Antz he provided the voice of the Drunk Scout while David Hyde Pierce who plays his youngest son on Frasier voiced the character Slim in the rival Disney/Pixar movie A Bug's Life.
- Starring in Roundabout Theater Company production of "Prelude to a Kiss" at the American Airlines Theater in New York. (February 2007)
- He was nominated for a 2004 Joseph Jefferson Award for Actor in a Principal Role in a Play for "I Never Sang for My Father" at the Steppenwolf Theatre Company in Chicago, Illinois.
- His favourite sitcom is Rising Damp (1974).
- He was nominated for a 1984 Joseph Jefferson Award for Actor in a Principal Role in a Play for "The Hothouse" at the Steppenwolf Theatre in Chicago, Illinois.
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