---
name: "Casey Siemaszko"
canonical: "https://film.one/person/casey-siemaszko"
fi1m_id: "casey-siemaszko"
imdb_id: "nm0797150"
tmdb_id: 1953
wikidata_id: "Q1047259"
roles: ["Actor"]
born: "17 March 1961"
reviewed_on_fi1m: 5
average_fi1m_score: 80
average_as: "actor"
average_over: 5
updated: "2026-10-04T20:47:11.644705+00:00"
licence: "© Fi1m Ltd. Written by AI under a human editor; checked against sources before publication. Quote with attribution and a link to the canonical URL."
---

# Casey Siemaszko

## Identity

Casey Siemaszko

- **Canonical:** https://film.one/person/casey-siemaszko
- **Type:** Person
- **Fi1m ID:** casey-siemaszko
- **IMDb ID:** nm0797150
- **TMDB ID:** 1953
- **Wikidata ID:** Q1047259
- **Same entity:** https://en.wikipedia.org/wiki/Casey_Siemaszko, https://www.wikidata.org/wiki/Q1047259, https://www.imdb.com/name/nm0797150/, https://www.themoviedb.org/person/1953

Actor. Born 17 March 1961 in Chicago, Illinois, USA.

## Details

- **Work:** Actor
- **Born:** 17 March 1961, Chicago, Illinois, USA
- **Active:** 1985–2009
- **Also known as:** Kazimierz A. Siemaszko, Kazimierz Andrew Siemaszko, Kazimierz Andrzej Siemaszko, Kazimierz Siemaszko
- **Frequently works with:** [Kiefer Sutherland](https://film.one/person/kiefer-sutherland.md)
- **Average Fi1m score:** 80, as actor, over 5 titles
- **Fi1m score by decade:** 1980s 85 (3), 1990s 80 (1), 2000s 64 (1)
- **Fi1m against the critics:** 80 to 74 across 5 titles
- **Score spread:** 3 at 80+, 2 at 60–79, 0 under 60
- **Lead roles:** 0 of 2 acting credits billed first or second
- **Genres:** Adventure 3, Drama 3, Comedy 2, Crime 2, Science Fiction 2, History 1
- **Screen time:** 8 hours of reviewed films
- **Box office:** $980m across 4 films with figures
- **Elsewhere:** https://en.wikipedia.org/wiki/Casey_Siemaszko, https://www.wikidata.org/wiki/Q1047259, https://www.imdb.com/name/nm0797150/, https://www.themoviedb.org/person/1953

## Streaming the US now

- **HBO Max:** [*Stand by Me*](https://film.one/film/stand-by-me.md) (88)

For United States; add `?region=XX` for another country.

## Biography

Casey Siemaszko is an American actor born Kazimierz Andrew Siemaszko on 17 March 1961 in Chicago, Illinois. He is known for supporting roles in 1980s films including *Back to the Future* (1985) as 3-D, *Stand by Me* (1986) as Billy Tessio, *Young Guns* (1988) as Charley Bowdre, and *Back to the Future Part II* (1989) as 3-D, as well as *Of Mice and Men* (1992) as Curley.

Siemaszko graduated from the Goodman School of Drama at DePaul University in 1983, having attended Saint Ignatius College Preparatory School. His father, Konstanty Siemaszko (1918–1999), was a Polish Underground fighter and survivor of the Sachsenhausen concentration camp who later worked as a choreographer in Chicago; his mother, Collette McAllister (1931–2008), was English. His sister, Nina Siemaszko, is also an actress. He narrated the 1998 documentary *The Polish-Americans*.

*Sources: en.wikipedia.org, imdb.com.*

## On Fi1m (5)

- *Public Enemies* (2009), Fi1m 64, as Harry Berman — [page](https://film.one/film/public-enemies.md)
- *Oz* (1997), Fi1m 80, as Detective Tarnowski — [page](https://film.one/tv/oz.md)
- *Back to the Future Part II* (1989), Fi1m 74, as 3-D — [page](https://film.one/film/back-to-the-future-part-ii.md)
- *Stand by Me* (1986), Fi1m 88, as Billy Tessio — [page](https://film.one/film/stand-by-me.md)
- *Back to the Future* (1985), Fi1m 92, as 3-D — [page](https://film.one/film/back-to-the-future.md)

## Complete filmography (61)

Every credit, newest first. Titles without a page can be requested for review on the HTML page.

- *Billions* (2016), series, as Seids
- *Killing Kennedy* (2013), as Jack Ruby
- *The Blacklist* (2013), series, as Sam Raimo — Fi1m 63, [page](https://film.one/tv/the-blacklist.md)
- *Elementary* (2012), series, as Michael McGee
- *NYC 22* (2012), series, as Blume
- *Person of Interest* (2011), series, as Lester Strickland — Fi1m 78, [page](https://film.one/tv/person-of-interest.md)
- *Unforgettable* (2011), series, as Lt. Greg Sartain
- *Blue Bloods* (2010), series, as Josh Thorp
- *White Collar* (2009), series, as Bertie Slavkin
- *Public Enemies* (2009), as Harry Berman — Fi1m 64, [page](https://film.one/film/public-enemies.md)
- *New Amsterdam* (2008), series, as Peter Huygens
- *Damages* (2007), series, as Detective Dan Williams — Fi1m 78, [page](https://film.one/tv/damages.md)
- *The Boy Who Cried Bitch: The Adolescent Years* (2007), Actor
- *The Inside* (2005), series, as Billy Ray Pope
- *Grand Theft Auto: San Andreas - The Introduction* (2004), as Johnny Sindacco (voice) (uncredited)
- *CSI: NY* (2004), series, as Paul Sabotini
- *The Street Lawyer* (2003), as Rafter Mayes
- *Law & Order: Criminal Intent* (2001), series, as Harvey Gruenwald
- *The Crew* (2000), as Young Bobby Bartellemeo
- *Law & Order: Special Victims Unit* (1999), series, as EPA Official
- *Limbo* (1999), as Bobby Gastineau
- *Storm of the Century* (1999), series, as Alton "Hatch" Hatcher
- *Chameleon II: Death Match* (1999), as Jake Booker
- *Together and Alone* (1998), as Billy
- *Oz* (1997), series, as Detective Tarnowski — Fi1m 80, [page](https://film.one/tv/oz.md)
- *Rose Hill* (1997), as Fergus Carroll
- *Bliss* (1997), as Tanner
- *Chicago Sons* (1997), series, Actor
- *Mistrial* (1996), as Detective Bobby Zito
- *The Phantom* (1996), as Morgan
- *Black Scorpion* (1995), as Dr. Goddard / The Breath Taker
- *Napoleon* (1995), as Conan (voice)
- *Milk Money* (1994), as Cash
- *704 Hauser* (1994), series, Actor
- *Teresa's Tattoo* (1994), as Michael
- *The Paint Job* (1993), as Cal
- *The Adventures of Brisco County, Jr.* (1993), series, as Ned Zed
- *Of Mice and Men* (1992), as Curley
- *Near Mrs.* (1992), as Colin Phipps
- *The Big Slice* (1991), as Mike Sawyer
- *The Chase* (1991), as Hutchinson
- *Law & Order* (1990), series, as Bart Rainey, Defense Attorney Shuman — Fi1m 72, [page](https://film.one/tv/law-and-order.md)
- *Back to the Future Part II* (1989), as 3-D — Fi1m 74, [page](https://film.one/film/back-to-the-future-part-ii.md)
- *Breaking In* (1989), as Mike Lafebb
- *Young Guns* (1988), as Charley Bowdre
- *Biloxi Blues* (1988), as Don Carney
- *Three O'Clock High* (1987), as Jerry Mitchell
- *Gardens of Stone* (1987), as Wildman
- *American Harvest* (1987), as Dakota
- *Stand by Me* (1986), as Billy Tessio — Fi1m 88, [page](https://film.one/film/stand-by-me.md)
- *Amazing Stories* (1986), as Jonathan
- *Miracle of the Heart: A Boys Town Story* (1986), as Andy Grainger
- *Amazing Stories* (1985), series, as Jonathan
- *Back to the Future* (1985), as 3-D — Fi1m 92, [page](https://film.one/film/back-to-the-future.md)
- *Secret Admirer* (1985), as Roger Despard
- *Silence of the Heart* (1984), as Jeff
- *Hard Knox* (1984), as Aaron Davis
- *Class* (1983), as Doug
- *St. Elsewhere* (1982), series, as Rick Messina — Fi1m 78, [page](https://film.one/tv/st-elsewhere.md)
- *The Facts of Life* (1979), series, Actor
- *Hallmark Hall of Fame* (1951), series, as Fergus

---
© Fi1m Ltd. Written by AI under a human editor; checked against sources before publication. Quote with attribution and a link to the canonical URL. Canonical: https://film.one/person/casey-siemaszko