Dr. Michael Stone is a professor of clinical psychiatry at Columbia. His specialty is personality disorders - most especially "borderline personality disorder." But in recent years he has concentrated as well on the extremes of personality, as shown by persons who show antisocial, psychopathic, and sadistic traits. This led to an interest in the kinds of people committing murder - spanning the spectrum from jealousy murders to serial killers and torturers. Recently he served as the host of the Discovery Channel show, "Most Evil," for which he was sent around the country interviewing serial killers and murderers of other types. This experience, plus his research over the past twenty years, led to his writing The Anatomy of Evil (appearing in July of 2009). The book explores the "why" factor: what are the inborn and environmental factors that cause certain people to commit murder and, at the extreme end, to behave with uncommon cruelty toward their fellow man. Modeled after Dante's Inferno, the book progresses from the least to the most "evil" crimes, and contains a chapter devoted to recent contributions from neuroscience toward understanding the mind of the psychopath.