Who Is William Peterson
William Petersen is an American actor best known for portraying forensic supervisor Gil Grissom on the CBS crime drama CSI: Crime Scene Investigation. He played the lead role for most of the series run and returned for guest appearances in later seasons.
William Petersen on CSI
On CSI, Petersen's character led a Las Vegas crime lab team, using forensic science to solve complex cases. His performance helped define the show's tone and contributed to its long run and strong ratings.
Career Beyond CSI
Before CSI, Petersen appeared in films such as Manhunter and television series including Michael Clayton. After CSI, he continued acting in select projects while stepping back from regular television work.
