Gilbert Arthur Grissom (born August 17, 1956Source: Season 2, episode 13), Ph.D. is a fictional character portrayed by William Petersen on the CBS crime drama CSI: Crime Scene Investigation and its sequel, CSI: Vegas. Grissom is a forensic entomologist and for the series' first nine seasons, a CSI Level III Supervisor employed by the Las Vegas Police Department. He appeared in 193 episodes of the original series, where he was succeeded by Raymond Langston (Laurence Fishburne) and later D.B. Russell (Ted Danson). Grissom returned in the sequel series, CSI: Vegas, in 2021.
Appearances Series regular Petersen appeared in every episode of the original series' first eight seasons, with the exceptions of:
Season 5: "Hollywood Brass" Season 6: "Gum Drops", "The Unusual Suspect" Season 7: "Sweet Jane", "Redrum" Petersen then appeared in the first ten episodes of the ninth season, before departing the main cast.
Petersen is part of the main cast for the first season of the sequel, CSI: Vegas.
Guest star Following his departure from the main cast, Petersen reprised his role on five occasions. Voice Season 09: "Turn, Turn, Turn" Season 13: "Wild Flowers", "Dead Air" On screen Season 11: "The Two Mrs. Grissoms"
Petersen also guest starred in "Immortality," CSI's feature-length series finale.
Petersen also guest stars as Gil Grissom in the TV series Without a Trace in Season 6, episode 6.
Creation Anthony E. Zuiker, who created the show, loosely based Grissom on real life Las Vegas Metropolitan Police Department criminalist Daniel Holstein. Zuiker was "fascinated" by Holstein, who, like Grissom, kept maggots and pig's blood in his refrigerator. Holstein worked as a consultant for the show. Zuiker originally named the character Gil Sheinbaum, but after he became part of the cast, William Petersen requested the name to be changed. Petersen and Zuiker decided to rename the character "Grissom," after astronaut Gus Grissom, of whom Petersen was a great admirer. The name Gil came from one of the actor's hobbies, fishing.
In 2000, CBS had bought the pilot script from Zuiker, and Nina Tassler, CBS's head of drama development, passed it on to Petersen, who had a pay or play contract with the network. Petersen has said that many TV shows were offered to him over the years, but he "didn't want to get locked down." However, he was impressed with the complexity of Grissom's character and he decided to audition. It was the second time Petersen portrayed a forensic scientist, having portrayed Will Graham in the 1986 film Manhunter.
Development Gil Grissom first appears in CSI: Crime Scene Investigation in the pilot episode. After this he appeared in almost every single episode of the show's first eight years, except in "Hollywood Brass", from season five, an episode that turns entirely around Jim Brass; besides him, only three other regular characters appear."Hollywood Brass". Sarah Goldfinger, Carol Mendelsohn (writers) & Bill Eagles (director). CSI. CBS. 2005-04-21. Season 5 Ep. 2. William Petersen did not appear during the season six episode "Gum Drops." This episode was originally going to be how Grissom was convinced that an abduction victim was still alive. When Petersen's nephew died, he flew home and was unavailable for the filming of the episode, which was rewritten to be centered on Nick. During 2007 (CSI season seven), William Petersen took a break from CSI to appear in a five-week run of the Trinity Repertory Company production of Dublin Carol in Providence, Rhode Island, resulting in Grissom taking a sabbatical, being replaced by Liev Schreiber, as Michael Keppler, who developed a small story arc through "Sweet Jane", "Redrum", and "Meet Market". Also in 2007, the character appeared in a two-part crossover with another CBS series, Without a Trace. It was the sixth episode of the sixth season, entitled "Where and Why." The plot of the crossover involved a serial killer that had eluded capture in Nevada and had escaped to New York City. Gil Grissom was brought in to assist in the apprehension.
Character background Early life Grissom was born as an only child to a middle-class family in Santa Monica, California. Grissom's father taught botany at a local college and passed his enthusiasm for natural sciences onto his son. His father died when Grissom was nine years old. Grissom recalls the day his father died to Catherine Willows in the episode "Still Life", "He came home from school, one hot humid day, laid down on the couch. I was watching TV, my mom brought in some cold drinks, but she couldn't wake him up. No one would tell me why." Consequently, as a young child, Grissom "played doctor" by performing necropsies on small, deceased animals in the local area.
Gil's mother, Betty, who became deaf as a result of the genetic disorder otosclerosis, was responsible for his love of books. As a result of his mother's deafness, Gil became fluent in American Sign Language in order to be able to communicate with her.
In the earlier seasons of CSI, it becomes clear that Gil is also beginning to lose his hearing as well; eventually he requires surgery to fully restore his hearing.
Grissom earned his Bachelor of Science degree in biology magna cum laude from the University of California, Los Angeles (UCLA), and his Ph.D. in Biology from the University of Chicago.Season 1 Ep. 10, "Sex, Lies and Larvae." He became a forensic entomologist. In the episode "Grissom vs. the Volcano", Catherine tells the story of losing at a science competition as a child against a "kid with some lame red ants." Later in the episode Nick also reveals that he lost a science competition and Grissom tells him to let it go. In his childhood science competition, Grissom was the kid with the ants.
In the season two episode "Bully for You", he told Warrick that in high school he was a "ghost" (meaning that he did not belong to any group in particular)."Ellie". Anthony E. Zuiker & Charlie Correll (director). CSI. CBS. 2001-12-06. Season 2 Ep. 10. When he was in college, Grissom financed his first body farm with his winnings from a high-stakes poker game."Revenge Is Best Served Cold". Anthony E. Zuiker & Danny Cannon (director). CSI. CBS. 2002-09-26. Season 3 Ep. 1. At the same time, he also attended boxing matches to learn about the patterns of bruise formations on bodies and eventual blood spatters from the injuries.
Career Grissom became a crime scene investigator around 1985 (Grissom mentioned in "Living Doll", which first aired on May 17, 2007, that he had been a crime scene investigator for 22 years). Grissom once mentioned losing a body while in Minneapolis, implying he spent time there before taking a job in Las Vegas."Precious Metal". Andrew Lipsitz, Naren Shankar (writers) & Deran Sarafian (director). CSI. CBS. 2003-03-04. Season 3 Ep. 18. This was mentioned again when he works with his former mentor, Dr. Phillip Gerard, played by Raymond J. Barry, stating that he used to work for him in Hennepin County, whose seat is Minneapolis."The Accused Is Entitled". Elizabeth Devine, Ann Donahue (writers) & Kenneth Fink (director). CSI. CBS. 2002-10-03. Season 3 Ep. 2.
He became the night shift team supervisor for the Las Vegas CSI unit on the second episode of the series, after Jim Brass was demoted following the death of co-worker Holly Gribbs."Cool Change". Anthony E. Zuiker (writers) & Michael Watkins (director). CSI. CBS. 2000-10-13. Season 1 Ep. 2. In season seven, Grissom took a sabbatical to teach a class at Williams College in Williamstown, Massachusetts, for four weeks."Leaving Las Vegas". Allen MacDonald, Carol Mendelsohn (writers) & Richard J. Lewis (director). CSI. CBS. 2007-01-04. Season 7 Ep. 11. Prior to his sabbatical, Grissom had been showing signs of "burnout." Upon his return, however, he appeared reinvigorated and told Warrick Brown that he "missed" Las Vegas."Law of Gravity". Richard Catalani, Carol Mendelsohn (writers) & Richard J. Lewis (director). CSI. CBS. 2007-02-08. Season 7 Ep. 15. After the resignation of Sara Sidle, his fiancée, from the lab, and the murder of Warrick Brown, his burnout seemed to be resurfacing. This is particularly evident in "Say Uncle", where, at the end of the episode, he expressed deep regret over solving a particularly depressing case.
Grissom announced his retirement just as evidence comes to light that the Dick and Jane Killer, a serial killer from the 1990s currently serving two life sentences, did not act alone and that his accomplice had begun killing again. Rather than leave in the middle of a case, Grissom stayed on to help solve it, and ultimately proved instrumental in saving the life of a woman who would have been the killer's latest victim. The case closed, Grissom, having already had a series of one-on-one farewells with his co-workers, silently left the crime lab and departed for Costa Rica for a reunion with fiancée Sara Sidle, an allusion perhaps to his comments in a season one episode that when he left, people would not throw a party for him because he was not the sort of person whom people would get deeply involved with. He also says to Warrick in season two ("Ellie") that when he left there would not be a cake in the break room—he would just pick up and leave.
Departure After reuniting with Sara Sidle, Grissom presumably remains in Costa Rica for a short time, before guest-lecturing at the Sorbonne, as noted in the tenth season. During the series' eleventh season, Grissom begins consulting for the Peruvian government on the etymology and physicality of the Inca . It is during this time that Sara and Grissom divorce, citing geographical differences. He later joins a group dedicated to protecting fish and wildlife in the Pacific, a role described as a "CSI at sea." After his activities lead him to the Port of San Diego, Grissom reunites with Willows and the CSI team in order to consult on a series of bombings in Las Vegas. During this case, he reconciles with Sidle, and the two sail off together in order to continue his work as a wildlife advocate.
Return Grissom and Sidle both returned in the sequel series CSI: Vegas for the first season with the reveal that they got married off-screen after "Immortality" and have been living on a boat together. Sara would arrive back in Vegas first due to sending Grissom out to collect jellyfish samples."Legacy". Jason Tracey (writers) & Uta Briesewitz (director). CSI: Vegas. CBS. 2021-10-06. Season 1 Ep. 01.
Characterization Personality Early episodes revealed Grissom to be a witty, enthusiastic, and quirky scientist who had some sense of humor. He flirted regularly and seemed to be constantly in a hyperactive state."I-15 Murders". Carol Mendelsohn (writers) & Oz Scott (director). CSI. CBS. 2001-01-12. Season 1 Ep. 11."Crate 'n Burial". Ann Donahue (writer) & Danny Cannon (director). CSI. CBS. 2000-10-20. Season 1 Ep. 3.
However, when he began to lose his hearing, Grissom retreated into himself and became easily irritated and unapproachable."High and Low". Naren Shankar, Eli Talbert (writers) & Richard J. Lewis (director). CSI. CBS. 2002-12-12. Season 3 Ep. 10. After his surgery, he lightened up a bit but never returned to the whimsical science nerd he once was.
Grissom is often regarded as well-educated but unusual in his approach toward his work and social life. In the series, some of his comments and actions can be seen to dumbfound his coworkers and superiors. His relationship with his subordinates in the office is portrayed as being a father figure to the team, but he is very professional in his work.
Despite being calm, Grissom can get angry when interrupted during an interrogation as seen in the season one episode "Table Stakes", when he berates Nick Stokes for calling him out of an interrogation.