science

Gil Grissom

Gil Grissom is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Gil Grissom rather than just read about it. In short: Gilbert Arthur Grissom (born August 17, 1956), 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.

Key takeaways

Gil Grissom belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Gil Grissom to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gil Grissom from memory before moving on to harder problems.

Reference excerpt

Gilbert Arthur Grissom (born August 17, 1956), 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. 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's 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. 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). When he was in college, Grissom financed his first body farm with his winnings from a high-stakes poker game. 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.

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Gil Grissom

Start with the simplest possible case. Write down what Gil Grissom claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Gil Grissom before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Gil Grissom ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Gil Grissom

In research: Gil Grissom appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Gil Grissom in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Gil Grissom is common in secondary-school and first-year university syllabi. It links to neighbouring topics CSI: Crime Scene Investigation characters, CSI: Vegas, Fictional American police detectives, so understanding it makes those chapters shorter.
In everyday life: Look for Gil Grissom outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Gil Grissom in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gil Grissom means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Gil Grissom out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gil Grissom in simple terms?

Why does Gil Grissom matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Gil Grissom?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Gil Grissom.