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William Louis Petersen is an United
States|American actor born on February 21, 1953,
in Evanston, Illinois|Evanston, Illinois. 

Although he comes from 4th generation Danish
immigrant stock, he attended a Catholic high
school, Bishop Kelly High School, in Boise,
Idaho|Boise, Idaho. Petersen attended Idaho State
University on a American football|football
scholarship. Later, moving back to Chicago, he
became a member of the Steppenwolf
Theatre|Steppenwolf Theatre Company. 

His film career began with a small part in the
1981 film Thief (movie)|Thief, and in 1986 he
starred as Will Graham in Manhunter
(film)|Manhunter (later to be remade as Red
Dragon). In a move perhaps indicative of his
career choices, Petersen is alleged to have passed
on a part in Oliver Stone's Platoon
(movie)|Platoon, as it would have kept him away
from his family. Instead, he worked on the 1987
made for TV movie Long Gone. In the 2000 release
The Contender (movie)|The Contender, Petersen
played the role of Governor Jack Hathway, a
candidate for Vice President following the death
of the incumbent. 

From 2000 to the present, Petersen has starred as
Gil Grissom in the successful CBS crime drama CSI:
Crime Scene Investigation. 

Petersen, who has one child from a previous
marriage, married longtime girlfriend Gina Cirone
in June of 2003.

==External link==
*imdb name|id=0676973|name=William Petersen
*http://www.bk.org Bishop Kelly High School
official site
*http://www.steppenwolf.org Steppenwolf Theatre
Company official site