Psychology Today | 13.11.2026 02:06
Dr. Hervey Cleckley, a professor of psychiatry and neurology, wrote a seminal book TheMask of Sanity, which was published in 1941. It provided the first in-depth depiction of psychopathology, which is now integrated into the broader category of the Dark Tetrad: narcissism, Machiavellianism, psychopathy, and everyday Sadism.
