William Louis Petersen is an American actor, best known for playing Gil Grissom on CSI. Petersen was offered the role of Henry Hill in the movie “Goodfellas”, but turned it down. In the 2000 release “The Contender”, he played the role of Governor Jack Hathway. He also appeared uncredited in the noir thriller “Mulholland Falls” as a character who finds himself on the violent receiving end of Los Angeles cops.
Since 2000, Petersen has gained his greatest fame starring as Dr. Gil Grissom in “CSI: Crime Scene Investigation”.