- ...believed to have been coined either by FBI agent Robert Ressler or by Dr. Robert D. Keppel in the 1970s (the credit for the term is still disputed). ''Seria ...appear to be quite normal, a state which Hervey Cleckley and psychologist Robert Hare call the "mask of sanity." There is frequently — but not always —27 KB (4,308 words) - 02:39, 14 May 2009