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The night shift team supervisor for the Las Vegas CSI unit, and a forensic entomologist with a degree in biology from UCLA. Grissom was born August 17, 1956. He is known for being a very thorough and methodical scientist, as well as for being a bit of a misanthropist. Grissom was raised Catholic, and although he stops short of denying the existence of a Creator, he is devoted to his beliefs that religion is of little use in today's society and has had theological/philosophical debates with more than one member of the cloth. Gil is proficient in sign language and used to have otosclerosis (inherited from his mother) but he underwent corrective surgery. It has been confirmed that he has a relationship with Sara Sidle to the viewers on the sixth season finale "Way to go" and to the rest of the lab on the seventh season finale "Living Doll", when Sara was kidnapped. This character is loosely based in real life CSI Daniel Holstein. In the season 8 episode The Case of the Cross-Dressing Carp, he proposes marriage to Sara, who accepts.

(wikipedia.org)