Sheldon is a senior theoretical physicist at Caltech and for the first ten seasons of The Big Bang Theory, shares an apartment with his colleague and best friend, Leonard Hofstadter (Johnny Galecki). In season 10, Sheldon moves across the hall with his girlfriend Amy, in the former apartment of Leonard's wife Penny. He is a former child prodigy with genius-level IQ, but displays an almost total lack of social skills, a tenuous understanding of humor, and difficulty recognizing irony and sarcasm in other people, although he himself often employs them. He exhibits highly idiosyncratic behavior and a general lack of humility or empathy. He also lacks toleration. These characteristics provide the majority of the humor involving him, which has caused him to be described as the show's breakout character. Some viewers have asserted that Sheldon's personality is consistent with Asperger syndrome, obsessive–compulsive disorder, and asexuality. Co-creator Bill Prady has stated that Sheldon's character was neither conceived nor developed with regard to any of these traits, although Parsons has said that in his opinion, Sheldon "couldn't display more traits" of Asperger's.
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