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Gilbert Arthur Grissom
Gilbert Arthur Grissom, Ph.D., a forensic entomologist and CSI Level III Supervisor for the Las Vegas Police Department, is a fictional character portrayed by William Petersen on the CBS crime drama CSI: Crime Scene Investigation and its sequel, CSI: Vegas. Grissom appeared in 198 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.