George Cooper Sr. was the father of Sheldon Cooper, George Cooper Jr. and Missy Cooper, and husband of Mary Cooper. He has been described as an almost-redneck, "Homer Simpson" Texan throughout the series. He died in 1994, approximately 13 years before the series began. When Sheldon was 12, he did a series of experiments involving the height of stairs. He increased the height of some stairs by 2 millimeters and as a result George tripped and broke his clavicle (Pilot). In "The Raiders Minimization", Sheldon says that his mother would put hamster poop in his father's tobacco when he used to drink.