The adult Sheldon is a senior theoretical physicist at The California Institute of Technology (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); they are also friends and coworkers with Howard Wolowitz (Simon Helberg) and Raj Koothrappali (Kunal Nayyar). In season 10, Sheldon moves across the hall with his girlfriend Amy (Mayim Bialik), in the former apartment of Leonard's wife Penny (Kaley Cuoco). He has a genius-level IQ, but displays a fundamental 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, empathy, and 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 and obsessive–compulsive disorder. 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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