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Hervey M. Cleckley


 

The pioneer of the research of psychopathy was Dr. Hervey Cleckley who released in 1941 a book called The Mask of Sanity: An Attempt to Clarify Some Issues About the So-Called Psychopathic Personality. Later on, Dr. Robert D. Hare came up with his Psychopathology Checklist to assess the main characteristics of psychopathic behaviour.

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