About William Petersen
Born 1953. William Petersen is an American film producer, stage actor, film actor, television actor, actor and television producer, known for CSI: Crime Scene Investigation.
William Louis Petersen (born February 21, 1953) is an American retired actor. He is best known for his role as Gil Grissom in the CBS drama thriller series CSI: Crime Scene Investigation (2000–2015), for which he won a Screen Actors Guild Award and was nominated for a Golden Globe Award; he was further nominated for three Primetime Emmy Awards as a producer of the show. He reprised his role as Gil Grissom in the sequel CSI: Vegas, which premiered on October 6, 2021.
He also starred in the films To Live and Die in L.A. (1985), Manhunter (1986), Young Guns II (1990), Fear (1996), The Contender (2000), Detachment (2011), and Seeking a Friend for the End of the World (2012).
Early life William Louis Petersen was born on February 21, 1953 in Evanston, Illinois, the youngest of six children of June (née Hoene; 1909–2006) and Arthur Edward Petersen (1907–2004), who worked in the furniture business. Of Danish and German descent, he was raised in the Roman Catholic faith of his mother. He has two brothers, Arthur Jr. and Robert, and three sisters, Anne, Mary Kay, and Elizabeth.
He graduated from Bishop Kelly High School in Boise, Idaho, in 1972. He was accepted to Idaho State University on a football scholarship. While at Idaho State, Petersen took an acting course, which changed the direction of his life.
In 1974 he and his wife Joanne left college and followed a drama professor to the Basque country. There he studied as a Shakespearean actor. Petersen also became interested in Basque culture: He studied the Basque language and gave his daughter the Basque name "Maite Nerea" ("My Beloved"); she was born in Arrasate/Mondragón in 1975.
Petersen returned to Idaho with the intention of being an actor. But not wanting to work a nonacting job there, he returned to the Chicago area, living with relatives. He became active in the theater and earned his Actors' Equity card. He performed with the Steppenwolf Theatre Company, of which he has been an ensemble member since 2008. He was a co-founder of the Remains Theater Ensemble, In 1986, he played FBI agent Will Graham in the first Hannibal Lecter film, Manhunter.
Because his role was so emotionally exhausting, he did everything he could to rid himself of Graham after finishing principal photography. He shaved off his beard, cut his hair, and bleached it blond. He also claims to have done this because, while rehearsing for a play in Chicago, he found he was speaking like Graham. He dyed his hair so he could look in the mirror and see a different person.
He declined a part in Oliver Stone's Platoon, as it would have kept him in the Philippines, away from his family. Instead, he worked on the 1987 HBO made-for-TV movie Long Gone as a minor league baseball player and manager named Cecil "Stud" Cantrell. Petersen was offered the role of Henry Hill in the film Goodfellas, but turned it down. An exposé about the film in the May 2015 issue of Playboy claims that Petersen turned down the audition altogether.
In a 1990 ABC three-part miniseries, The Kennedys of Massachusetts, Petersen played U.S. President John F. Kennedy's father, Ambassador Joseph P. Kennedy. The film won an Emmy and a Golden Globe from eight and two nominations, respectively. Also in 1990, Petersen portrayed the infamous Patrick Floyd "Pat" Garrett in Young Guns II.
In 1993, Petersen appeared in a CBS TV miniseries Return to Lonesome Dove, as former Ranger Gideon Walker. He played Steven Walker, a father who stops at nothing to break up the relationship between his daughter and her vicious boyfriend in Fear (1996). Petersen played Governor Jack Hathaway, an unscrupulous candidate for vice president following the death of the incumbent, in The Contender in 2000.
He appeared uncredited in the noir thriller Mulholland Falls as a character who finds himself on the violent receiving end of a Los Angeles police squad's tactics. In 1999, he starred in Kiss the Sky as "Jeff." He appeared as part of an all-star cast in the 1997 remake of 12 Angry Men (as Juror #12, a.k.a. "the Snob").
From 2000 to 2009, he played Dr. Gil Grissom in the CBS crime drama CSI: Crime Scene Investigation. Petersen took a break from CSI in 2006 to appear in a five-week run of the Trinity Repertory Company production of Dublin Carol by Conor McPherson, in Providence, Rhode Island. On July 15, 2008, the Associated Press reported that Petersen was leaving the show as a regular following Season 9's tenth episode, in order to pursue more stage-acting opportunities, but that he might return for guest spots. He remained an executive producer of the show.
Personal life In 1975, Petersen and his wife Joanne Brady had a daughter, Maite. They later divorced.
In June 2003, Petersen married his longtime girlfriend Gina Cirone. On July 5, 2011, Petersen and Cirone had twins, a daughter and son, via surrogate.
In 2004, he described to Playboy a near-death experience he had in the 1980s which gave him "assurance" that there is an afterlife. In August 2021, he was taken to the hospital via ambulance after feeling unwell on the set of CSI: Vegas. He was experiencing symptoms of exhaustion after 12 weeks of shooting, and was released from the facility soon after.
Honors On February 3, 2009, Petersen received a star on the Hollywood Walk of Fame.
Filmography As actor Film
Television Year Title Role Notes 1986 The Twilight Zone Edward Sayers Episode: "Need to Know" 1987 Long Gone Cecil Cantrell Television film 1990 The Kennedys of Massachusetts Joseph P. Kennedy Miniseries 1992 Keep the Change Joe StarlingTelevision film1993 Curacao Stephen Guerin Return to Lonesome Dove Gideon Walker 3 episodes 1995 Fallen Angels George Episode: "Good Housekeeping" 1996 The Beast Whip DaltonTelevision film 1997 12 Angry Men Juror #121998 The Staircase Joad The Rat Pack President John F. Kennedy 2000–2015 CSI: Crime Scene Investigation Gil Grissom Main role (seasons 1–9) Guest role (seasons 11, 13 & 15) 2001 Haven Jackson Connolly Television film 2007 Without a Trace Gil Grissom Episode: "Where and Why?" 2013 Blue Mitch Episode: "Hard Time" 2015 Manhattan Colonel Emmett Darrow 10 episodes 2021 CSI: Vegas Gil Grissom
Video games
As producer Hard Promises (1991) Keep the Change (1992) CSI: Crime Scene Investigation (2000–2015) CSI: Vegas (2021–2024)
Theatre As actor
Don’t just read it —
keep it.
Full-length biographies made to live with: read them, listen on the way to work, watch them tonight.
- E-book
- Audio
- Video
Instant download · yours to keep · every purchase keeps this site free
Important facts
Family & relationships
People in William Petersen's life
Named in this biography and alive at the same time
Contemporaries
People whose lives overlapped William Petersen's
Frequently asked questions
Who is William Petersen?
American actor
When was William Petersen born?
William Petersen was born on 21 February 1953 in Evanston.
What is William Petersen's occupation?
William Petersen is a film producer, stage actor, film actor, television actor, actor and television producer.
What is William Petersen known for?
William Petersen is known for CSI: Crime Scene Investigation.
What nationality is William Petersen?
William Petersen is American.
Sources & further reading
· Wikipedia: William Petersen
Cite this page
APA: Biography.guide. (2026). William Petersen. https://biography.guide/william-petersen/
MLA: "William Petersen." Biography.guide, https://biography.guide/william-petersen/.
Chicago: "William Petersen." Biography.guide. https://biography.guide/william-petersen/.
Data last updated: 2026-09-22 · Spot an error? Report a correction.
Portrait: Wikimedia Commons · author & licence
Page generated 2026-09-27 05:02 UTC