Robert Hare is inarguably among the most distinguished psychopathy researchers. Perhaps his most important contributions are the Psychopathy Checklist (PCL; Hare, 1980) and the Psychopathy Checklist-Revised (PCL-R; Hare, 1991), measures coordinated closely with Cleckley’s (1976) original list of 16 features of psychopathy. The PCL(-R) became the main competitor to the conceptualization of antisocial personality disorder (ASPD) provided within the highly successful and influential third edition of the American Psychiatric Association’s (APA) Diagnostic and Statistical Manual of Mental Disorders (DSM-III; APA, (1980). The PCL(-R) challenged researchers to question the validity of the APA ASPD. We suggest that Hare’s perspective was ultimately recognized as being preferable albeit, not supririsngly, some questions and concerns have also been raised. In sum, the field of psychopathy benefited substantially by the insight, dedication, and research of Robert Hare.