A Canadian psychologist and creator of the Psychopathy Checklist-Revised (PCL-R), whose work is central to understanding how psychopathy is diagnosed and the influence it has on institutional practices.

An American psychiatrist who revolutionized modern psychiatry with the DSM-III, moving the field towards a system of observable symptoms and checklists to improve diagnostic reliability.

An American psychiatrist and former DSM-IV chair who critiques the over-medicalization of normal behavior, warning of the societal costs of diagnostic inflation.

An American psychologist known for his 1973 experiment that exposed the fragility of psychiatric diagnoses by having pseudopatients admitted to psychiatric hospitals.

A Canadian psychiatrist who led radical therapeutic communities at Oak Ridge, known for his unconventional treatments intended to foster empathy in violent offenders.

A forensic psychiatrist who succeeded Barker at Oak Ridge, known for furthering the experimental therapeutic methods with mass LSD trips and unorthodox sessions.

A corporate executive famous for his ruthless cost-cutting strategies, who serves as a case study for corporate psychopathy.

The founder of a violent paramilitary group, who provides a high-stakes subject for applying psychopathy assessment skills.

The founder of Scientology, known for his organized anti-psychiatry movement and his critique of psychiatric practices.