Dr. Sheldon Cooper is a fictional character on the CBS television comedy series The Big Bang Theory, portrayed by actor Jim Parsons. He is Leonard Hofstadter's best friend, roommate, and colleague.

He is named after actor/producer Sheldon Leonard. He is calculating and cynical, believing that Leonard is only setting himself up for disappointment as he continues to have a crush on their neighbor, Penny. Sheldon often represents the voice of reason amongst his friends, as he does not hesitate to point out the facts, although his stubbornness, inflated ego, and quirks are usually the source of conflicts during the show.

Currently, the Jim Parsons Emmy Campaign Committee is attempting to obtain an Emmy nomination for Parsons. Originally from East Texas, Sheldon was a child prodigy, starting college at the age of eleven (right after completing the fifth grade) and graduate school at fourteen. When he was a kid, he conducted experiments involving the height of stairs and deduced that if a step on a staircase is as little as 2 millimeters off, most people will trip (this resulted in his father breaking his clavicle).

When Sheldon was twelve years old, he wanted a titanium centrifuge to separate radioactive isotopes. As a kid, he built a CAT scanner, a so-called "Death Ray", and a robotic arm made using his sister's Easy Bake Oven, which he modified. According to his mother, he also attempted to build a nuclear reactor at thirteen years old in order to provide free electricity for his town; however this failed after a government agent informed him that it was illegal to store yellowcake uranium in a shed.

At age fourteen, he dabbled in lasers, resulting in his being sent to boarding school after the government took his laser away and hushed the college professor who witnessed the experiment. He was the youngest person to receive the Stevenson Award six months after his fourteenth birthday. Sheldon worked as a visiting professor in Germany at age fifteen, and received his first PhD at sixteen years old, working on twistor theory.

He then spent four years on his (second) dissertation, and has held his current job for three-and-a-half years. He is a theoretical physicist and possesses a Master's degree and 2 PhDs. Sheldon conducts string theory research at Caltech.

Because of his high IQ (of 187), he tends to question the theories of his colleagues, especially Leonard. Throughout the course of the show, Sheldon has switched disciplines from bosonic string theory to heterotic string theory and reconciled the black hole information paradox using a string network condensate approach. Like Leonard, Sheldon keeps a whiteboard in the living room for scientific theories and equations, most of which feature complex higher mathematics, such as virtual particles in quantum mechanics, or series of Riemann zeta functions.

Sheldon has an overly extensive general knowledge as well, such as shown by his comments regarding the introduction of the fork into Thailand. As a side note, Sheldon does not seem to be able to tolerate alcohol very well, as shown that after drinking something alcoholic (which Penny described as: "Some virgin cuba libres that were a little slutty.") he began to play the keyboard and sing songs from the musical "The Fiddler on the Roof". The same goes for caffeine, just a little coffee sends him hurtling round the apartment when it was meant to keep him up at night in the episode The Work Song Nanocluster.

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