William Petersen
William Petersen Petersen on the set of CSI in March 2004. Born (1953-02-21) February 21, 1953 (age 61) Evanston, Illinois, U.S. Years active 1976–present Spouse(s) Joanne Brady (1974–1981; divorced) Gina Cirone (2003–present) Children 3 William Louis Petersen (born February 21, 1953) is an American actor and producer, best known for playing Dr. Gilbert "Gil" Grissom on the hit CBS series CSI: Crime Scene Investigation, Richard Chance in the film To Live and Die in L.A., and Will Graham in the film Manhunter.