Chicago Tribune: "Hare, 71, is one of the world's foremost experts on psychopaths. He developed the 'Psychopathy Checklist,' which has been used to diagnose psychopaths for 25 years, and the 'P-Scan,' which is widely used by police departments to screen out psychopaths among recruits. Hare sees similarities between the psychopaths he has studied -- Mafia hit men and sex offenders -- and the corporate crooks behind the Enron and WorldCom scandals."