William Louis Petersen is an American actor and producer, best known for playing Dr. Gilbert "Gil" Grissom on the hit CBS series CSI: Crime Scene Investigation, and as Will Graham in the film Manhunter. Petersen was born in Evanston, Illinois, the youngest of six children of June and Arthur Edward Petersen, Sr. , who worked in the furniture business. He is of Danish and German descent. He has two brothers, Arthur, Jr. and Robert, plus three sisters: Anne, Mary Kay, and Elizabeth. He graduated from Bishop Kelly High School in Boise, Idaho, in 1972. He was accepted to Idaho State University...
|Birthdate:||February 21, 1953|
|Education:||Idaho State University, Bishop Kelly High School|
|Also known as:||William Louis Petersen, Billy, William L. Peterson|