# Dermot Mulroney
**Dermot Mulroney** is an American actor and cellist, born and raised in [Alexandria, Virginia](https://www.edgepedia.org/alexandria-virginia), whose screen career began with the 1986 CBS television movie *Sin of Innocence* and now spans more than 70 feature films.[1](https://www.washingtonpost.com/archive/lifestyle/1986/03/26/breaking-into-the-act/a5bee82a-b4f7-4d49-a308-fe6c4eb321b2/) • [2](https://www.sonyclassics.com/truth/truth_presskit.pdf) He is best known for the 1997 romantic comedy *My Best Friend's Wedding* opposite [Julia Roberts](https://www.edgepedia.org/julia-roberts), and he has worked steadily in both film and television, most recently as Battalion Chief Dom Pascal on NBC's *Chicago Fire*.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) • [4](https://www.thewrap.com/media-platforms/tv/chicago-fire-dermot-mulroney-leaving-season-15/) Alongside acting, he is a longtime cellist in composer [Michael Giacchino](https://www.edgepedia.org/michael-giacchino)'s recording orchestra, playing on soundtracks including *Rogue One: A Star Wars Story*, *Jurassic World*, and *Spider-Man: Homecoming*.[5](https://time.com/4594729/rogue-one-composer-score/)
| Key fact | Detail |
|---|---|
| Origins | Middle child of five, born and raised in Alexandria, Virginia; coxswain for the T.C. Williams High School crew team and cellist in as many as six area youth orchestras at one time[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) • [6](https://www.washingtonpost.com/archive/lifestyle/tv/1987/05/17/dermot-mulroney-from-alexandria-to-tinseltown/f95b35d5-3d54-4984-a0c0-dc656fe3aac4/) |
| Discovery | A William Morris agent visited Northwestern University during his senior year and signed him on the spot; he moved to Hollywood and landed his first role after about three months of auditions[1](https://www.washingtonpost.com/archive/lifestyle/1986/03/26/breaking-into-the-act/a5bee82a-b4f7-4d49-a308-fe6c4eb321b2/) |
| First role | *Sin of Innocence* (1986), a CBS made-for-TV movie, in which he and Megan Follows played teenage stepbrother and stepsister[1](https://www.washingtonpost.com/archive/lifestyle/1986/03/26/breaking-into-the-act/a5bee82a-b4f7-4d49-a308-fe6c4eb321b2/) |
| Signature film | *My Best Friend's Wedding* (1997), with Julia Roberts, Cameron Diaz, and Rupert Everett; the film had three Golden Globe nominations and one Academy Award nomination[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) • [7](https://time.com/4074615/my-best-friends-wedding-tv-reboot/) |
| Film output | Over 70 feature films, ranging from *Young Guns* (1988) and *Longtime Companion* (1990) to *August: Osage County* (2013) and *Insidious: Chapter 3* (2015)[2](https://www.sonyclassics.com/truth/truth_presskit.pdf) • [8](https://www.metacritic.com/person/dermot-mulroney/) |
| Second career | Cellist in Michael Giacchino's orchestra on scores including *Rogue One*, *Jurassic World*, *Spider-Man: Homecoming*, *Inside Out*, *Coco*, and *Incredibles 2*[5](https://time.com/4594729/rogue-one-composer-score/) • [8](https://www.metacritic.com/person/dermot-mulroney/) |
| Recent TV | Battalion Chief Dom Pascal on *Chicago Fire*, joining in season 13 and exiting early in season 15[4](https://www.thewrap.com/media-platforms/tv/chicago-fire-dermot-mulroney-leaving-season-15/) |
## Early life and discovery
Mulroney grew up in Alexandria, Virginia, as the middle child of five.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) His acting began in junior high school, when he played the Stage Manager in [Thornton Wilder](https://www.edgepedia.org/thornton-wilder)'s *Our Town*, and he performed in backyard theater and school plays, but his chief creative pursuit through youth was the cello.[6](https://www.washingtonpost.com/archive/lifestyle/tv/1987/05/17/dermot-mulroney-from-alexandria-to-tinseltown/f95b35d5-3d54-4984-a0c0-dc656fe3aac4/) After attending the Interlochen Summer Arts Camp in Michigan in the summer of 1979, he decided music would remain a personal interest rather than a career, and focused on drama instead.[9](https://www.tvinsider.com/people/dermot-mulroney/)
At [Northwestern University](https://www.edgepedia.org/northwestern-university) in Illinois he was a radio-TV-film major, more involved in production classes than drama, but he appeared in the school's popular "Mee-Ow Show," an annual revue of improvisation with audience participation.[6](https://www.washingtonpost.com/archive/lifestyle/tv/1987/05/17/dermot-mulroney-from-alexandria-to-tinseltown/f95b35d5-3d54-4984-a0c0-dc656fe3aac4/) His plan after graduation was to work as a cameraman in Chicago.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) Instead, in his senior year, a [William Morris](https://www.edgepedia.org/william-morris) agent visited the college, produced a contract, and signed him; she then asked him to relocate to Hollywood.[1](https://www.washingtonpost.com/archive/lifestyle/1986/03/26/breaking-into-the-act/a5bee82a-b4f7-4d49-a308-fe6c4eb321b2/) After roughly three months of auditions, while his parents supported him and he was on the verge of applying for a waiter's job, he was called to read for *Sin of Innocence*, which became his first role.[1](https://www.washingtonpost.com/archive/lifestyle/1986/03/26/breaking-into-the-act/a5bee82a-b4f7-4d49-a308-fe6c4eb321b2/)
## 1980s and 1990s film career
Mulroney moved quickly into the Hollywood mainstream. He played a teen father in the 1987 ABC movie *Daddy*, an outlaw called Dirty Steve in *Young Guns* (1988), and a bumbling intruder in *Career Opportunities* (1991).[10](https://www.latimes.com/archives/la-xpm-1991-06-15-ca-348-story.html) His breakout from the "troubled youth" mold came with HBO's telefilm *Long Gone* (1987), in which he played an Alabama-born baseball player recruited to a struggling minor league team; his real mother appeared in one scene as his character's mother.[9](https://www.tvinsider.com/people/dermot-mulroney/) • [6](https://www.washingtonpost.com/archive/lifestyle/tv/1987/05/17/dermot-mulroney-from-alexandria-to-tinseltown/f95b35d5-3d54-4984-a0c0-dc656fe3aac4/)
**Early dramatic work.** He had a notable role as a dying AIDS patient in the independent drama *Longtime Companion* (1990), an early film dealing with the media's treatment of homosexuality and the AIDS crisis.[9](https://www.tvinsider.com/people/dermot-mulroney/) Other 1990s credits include the serial-killer thriller *Copycat*, the apocalyptic suspense film *The Trigger Effect* (1996) from director [David Koepp](https://www.edgepedia.org/david-koepp), Robert Altman's *Kansas City*, and the indie *Living in Oblivion*.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) • [11](https://themovieelite.com/interview-with-dermot-mulroney-on-the-blazing-world/) At the MTV Movie Awards he shared a "Best Kiss" accolade with [Winona Ryder](https://www.edgepedia.org/winona-ryder) for *How to Make an American Quilt* (1996), which pointed him toward romantic-lead roles.[9](https://www.tvinsider.com/people/dermot-mulroney/)
**Romantic comedy.** *My Best Friend's Wedding* (1997), in which he played Michael O'Neal, the best friend Julia Roberts's character realizes she loves, became the film he is best known for.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) Mulroney has said that the film, combined with 2005's *The Wedding Date*, typecast him as a romcom man, which he believes was unfair.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) In 2005 he appeared in a run of three romance-centered films, *The Wedding Date*, *Must Love Dogs*, and *The Family Stone*, in which he played Everett Stone, the son bringing [Sarah Jessica Parker](https://www.edgepedia.org/sarah-jessica-parker)'s character home to meet his family at Christmas.[12](https://www.tvinsider.com/swooon/1167262/dermot-mulroney-romance-movies-show-roles-family-stone-new-girl/) • [13](https://riverdaley.org/wp-content/uploads/2026/01/January-2026-New-Beginnings-Newsletter-Google-Docs.pdf)
## Television work
From the 2010s onward Mulroney found steady work on television, appearing in *New Girl*, *American Horror Story*, *Arrested Development*, *Enlightened*, and the US adaptations of *[Shameless](https://www.edgepedia.org/shameless-american-tv-series)* and *Four Weddings and a Funeral*, and joining the second season of the Amazon series *Hanna* as the villain.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) His first sitcom role came as a favor to his real-life friend [Jennifer Aniston](https://www.edgepedia.org/jennifer-aniston), in a three-episode arc as Rachel's co-worker on *Friends*.[9](https://www.tvinsider.com/people/dermot-mulroney/)
In 2024 he joined NBC's *Chicago Fire* as Battalion Chief Dom Pascal, brought in to lead Firehouse 51 in the show's 13th season.[4](https://www.thewrap.com/media-platforms/tv/chicago-fire-dermot-mulroney-leaving-season-15/) It was his first time doing a 22-to-24-episode network series.[14](https://www.cinemablend.com/television/dermot-mulroney-not-happy-leaving-chicago-fire) After a brief absence from season 14, it was announced that he would exit the show early in season 15, with the character written off after two seasons.[4](https://www.thewrap.com/media-platforms/tv/chicago-fire-dermot-mulroney-leaving-season-15/) • [14](https://www.cinemablend.com/television/dermot-mulroney-not-happy-leaving-chicago-fire)
## The cello
Mulroney has maintained a parallel career as a session cellist. He played in the scoring orchestra for *Mission: Impossible III* among other blockbusters, and he is a longtime member of composer Michael Giacchino's orchestra, performing on scores including *Up*, *Star Trek*, *Rogue One: A Star Wars Story*, *Jurassic World*, and *Spider-Man: Homecoming*.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) • [5](https://time.com/4594729/rogue-one-composer-score/) His *Rogue One* participation was kept secret even from him: [Star Wars](https://www.edgepedia.org/star-wars) films are recorded under code names, and Mulroney unknowingly mentioned the code name "Los Alamos" on *The Late Show with Stephen Colbert* before realizing at the first session, when he saw the title on the sheet music, that he was recording a Star Wars score.[5](https://time.com/4594729/rogue-one-composer-score/)
## Personal life and other notes
Mulroney was first married to the actor [Catherine Keener](https://www.edgepedia.org/catherine-keener), with whom he has a son; he has two daughters with his wife, the singer Prima Apollinaare.[3](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed) He made his directorial debut with *Love, Wedding, Marriage*.[15](https://www.broadwayworld.com/article/BWW-EXCLUSIVE-Dermot-Mulroney-THE-FAMILY-TREE-20110825) His name similarity to fellow actor [Dylan McDermott](https://www.edgepedia.org/dylan-mcdermott) has been a running joke in popular culture, including a recurring *Saturday Night Live* game-show sketch, "Dylan McDermott or Dermot Mulroney," and Mulroney has been interviewed about the confusion for years.[16](https://www.avclub.com/dermot-mulroney-on-my-best-friend-s-wedding-hanna-and-1844301362) He also spoofed himself in the 2015 comedy *The D Train*, playing a much more famous actor encountered by [James Marsden](https://www.edgepedia.org/james-marsden)'s character.[17](https://time.com/3847505/james-marsden-the-d-train-plot-twist/)
## References
1. [Breaking Into the Act: 'Innocence' & Alexandria's Dermot Mulroney, The Washington Post (March 25, 1986)](https://www.washingtonpost.com/archive/lifestyle/1986/03/26/breaking-into-the-act/a5bee82a-b4f7-4d49-a308-fe6c4eb321b2/)
2. [Truth press kit, Sony Pictures Classics (2015)](https://www.sonyclassics.com/truth/truth_presskit.pdf)
3. [Dermot Mulroney: 'I remember Charlie Sheen climbing over a balcony, half-clothed …', The Guardian (July 8, 2020)](https://www.theguardian.com/film/2020/jul/08/dermot-mulroney-charlie-sheen-climbing-over-balcony-half-clothed)
4. ['Chicago Fire' Star Dermot Mulroney to Exit After 2 Seasons, TheWrap](https://www.thewrap.com/media-platforms/tv/chicago-fire-dermot-mulroney-leaving-season-15/)
5. [You Probably Won't See Rogue One's Biggest Change to Star Wars, Time (2016)](https://time.com/4594729/rogue-one-composer-score/)
6. [Dermot Mulroney: From Alexandria to Tinseltown, The Washington Post (May 16, 1987)](https://www.washingtonpost.com/archive/lifestyle/tv/1987/05/17/dermot-mulroney-from-alexandria-to-tinseltown/f95b35d5-3d54-4984-a0c0-dc656fe3aac4/)
7. [My Best Friend's Wedding Is The Latest Movie to Get a TV Reboot, Time (2015)](https://time.com/4074615/my-best-friends-wedding-tv-reboot/)
8. [Dermot Mulroney, Metacritic](https://www.metacritic.com/person/dermot-mulroney/)
9. [Dermot Mulroney – Actor, TV Insider](https://www.tvinsider.com/people/dermot-mulroney/)
10. [Dermot Mulroney, at 27, Knows a Lot About Playing 18-Year-Olds, Los Angeles Times (June 15, 1991)](https://www.latimes.com/archives/la-xpm-1991-06-15-ca-348-story.html)
11. [Interview with Dermot Mulroney on The Blazing World, The Movie Elite](https://themovieelite.com/interview-with-dermot-mulroney-on-the-blazing-world/)
12. [Romance Rewind: Dermot Mulroney Looks Back at 'Family Stone,' 'New Girl' & More, TV Insider](https://www.tvinsider.com/swooon/1167262/dermot-mulroney-romance-movies-show-roles-family-stone-new-girl/)
13. [Riverdale Y January 2026 Newsletter (The Family Stone listing)](https://riverdaley.org/wp-content/uploads/2026/01/January-2026-New-Beginnings-Newsletter-Google-Docs.pdf)
14. [Dermot Mulroney Does Not Sound Super Happy About Leaving Chicago Fire, CinemaBlend](https://www.cinemablend.com/television/dermot-mulroney-not-happy-leaving-chicago-fire)
15. [BWW Exclusive: Dermot Mulroney & The Family Tree, BroadwayWorld (2011)](https://www.broadwayworld.com/article/BWW-EXCLUSIVE-Dermot-Mulroney-THE-FAMILY-TREE-20110825)
16. [Dermot Mulroney on My Best Friend's Wedding, Hanna, and not being Dylan McDermott, The A.V. Club (July 9, 2020)](https://www.avclub.com/dermot-mulroney-on-my-best-friend-s-wedding-hanna-and-1844301362)
17. [James Marsden: The D Train's Big Plot Twist Is Not 'A Cheap Punch Line', Time (2015)](https://time.com/3847505/james-marsden-the-d-train-plot-twist/)
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*Topic: Encyclopedia › Arts and culture › Screen and stage › Film and television › Screen people and creators › Screen actors of the Anglosphere and Europe › American actors: 1970s to 1990s › Surnames Mo to N*
*Initially written Sep 17, 2026 · Reviewed: Sep 17, 2026; Sep 30, 2026; Oct 25, 2026 · Edited: Sep 17, 2026; Sep 30, 2026; Oct 12, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*
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