Gilbert “Gil” Grissom was born on August 17, 1956 in Santa Monica, California and grew up in Marina Del Rey, California. His father was a botanist and his mother ran an art gallery in Venice. Grissom’s father died when he was nine years old. Grissom’s mother was deaf and he inherited his mother’s otosclerosis, a disease which nearly led to the loss of his hearing. He was raised Roman Catholic, but he now seems to be a lapsed Catholic. He became a forensic entomologist, earning his degree in biology from UCLA. Now works as the night shift team supervisor for the Las Vegas CSI.