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- Born: August 17, 1956
- Full name: Dr. Gilbert "Gil" Grissom, Ph.D
- Named after astronaut Gus Grissom
- Show: CSI
- First appearance: October 6, 2000 (Premiere Episode)
- Last appearance: January 15, 2009
- Occupation: Crime Scene Investigator Level 3, Head Investigator, Night-shift Supervisor
- Specialist in Forensic Entomology
- Engaged to Sara Sidle
- Years on show: 8
- Grissom's mentor is Dr. Phillip Gerard
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Actor Information
- Birth name: William Louis Petersen
- Birth date: February 21, 1953
- Birthplace: Evanston, Illinois
- Spouse: Gina Cirone (2003-present)
- Awards: Screen Actors Guild Award
- Notable projects: Young Guns II, Fear, The Contender
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Character Quotes
- "We look at each case objectively, without presupposition, regardless of sex, creed, color, or bubblegum flavor." IMDb
- "Could you close the door, please? No, from the other side." CSI: Wiki
- "Paperwork, paperclips, paperpunchers. All these people want me to do is push paper. Nobody wants me to solve crimes." - Crimelab.nl
- "By law, you gotta disclose everything. Three bedrooms. Two baths. And a skeleton." - Crimelab.nl
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Gil Grissom Questions
Is William Petersen returning full-time to his character, Gill Grissom, on CSI? 2 AnswersHow about msnbc.com Grissom announces he’s leaving ‘CSI’. Or fan site CSI Files. Or 'CSI's' Petersen: 'I won't miss Grissom' on CNN.com. I'd say it's pretty m... read more
Seattle police Chief Gil Kerlikowske is now the nations drug czar. Do we really need czars? 1 AnswerI don't think we really "need" czars. But at the same time, I do think they are useful. Without a drug czar, the jurisdiction of the war on drugs would be the ... read more



