<P> The PCL was originally developed in the 1970s by Canadian psychologist Robert D. Hare for use in psychology experiments , based partly on Hare 's work with male offenders and forensic inmates in Vancouver , and partly on an influential clinical profile by American psychiatrist Hervey M. Cleckley first published in 1941 . </P>
who developed what is considered to be the industry standard for assessing and diagnosing sociopathy
Robert D. Hare