Dr. James Fallon is a neuroscientist who later in his career found out that he had the same brain as the psychopaths he studied. He finds that what made him not turn into an aggressive serial killer was his awesome childhood and the fact that he was incredibly OCD about being the perfect catholic boy while growing up.
What type do you think he is? Can you even type psychopaths? He's very charming and impulsive with natural leadership skills and a gift for manipulation, which apparently are common psychopath traits. He says that presidents such as Teddy Roosevelt (commonly typed as SLE) also probably had psychopath traits, and that a lot of the great leaders in history had them. It made me wonder if brain type & upbringing have much to do with a persons personality type.