Hear an interview of the man who was the first to get inside the head of some of the most notorious serial killers to figure out what makes them tick and maybe some answers for why humanity goes astray into the darkside.

The mad bomber "George Metesky, Son Of Sam "David Berkowitz, Richard Speck, Ted Bundy, Green River Murders, Gary Heidnik, Edmund Kemper, Ed Gein, Charles Manson, John Wayne Gacy, Jeffrey Dahmer