Columbia University professor Michael Stone knows evil. He's a forensic psychologist — the type of expert that provides testimony on the mental state of accused murderers when a declaration of insanity can mean the difference between life and death row. Inspired by the structure of Dante's circles of hell, Stone has created his own 22-point "Gradations of Evil" scale, made up of murderers in the 20th century. "I thought it would be an interesting thing to do," he says. His scale is loosely divided into three tiers. First are impulsive evil-doers: driven to a single act of murder in a moment of rage or jealousy. Next are people who lack extreme psychopathic features, but may be psychotic — that is, clinically delusional or out of touch with reality. Last are the profoundly psychopathic, or "those who possess superficial charm, glib speech, grandiosity, but most importantly cunning and manipulativeness," Stone says. "They have no remorse for what they've done to other people." I place Howard stern because of his narcissism and closeted homosexual tendencies that are probably masking a dark and psychotic tendencies at a 9! 7. Narcissists Highly narcissistic killers who are often possessive, not distinctly psychopathic, but "with a psychopathic core." They typically kill loved ones or family members out of jealousy. 8. Fit of Rage Non-psychopathic people, who live with an underlying, smoldering rage, then kill when that rage is ignited SEMI-PSYCHOPATHS Those who show a "fair number" of psychopathic traits — grandiosity, superficial charm, or general lack of remorse. 14. Schemers Ruthlessly self-centered and psychopathic, schemers stop at nothing to deceive, con and steal.