Currently, psychopathy and related terms such as antisocial personality disorder are popular yet problematic constructs within forensic psychology and other disciplines. Psychopathy is traced typically to the works of Pinel and Prichard in the early 19(th) century, and it has even been linked to biblical passages, although there appears to be little or no support for the latter claim. The first use of the term psychopathy in German psychiatry of the mid-19(th) century referred only to psychological disturbance in general, or personality diseases', although German psychiatrists such as Kraepelin did propose more specific definitions of the term related to social deviance. Our modern understanding of psychopathy as a psychiatric disorder of an undetermined genetic origin involving antisocial elements and a lack of feeling or concern for others owes much to the clinical work and writings of Cleckley. Antisocial personality disorder appears similarly to derive from the work of psychiatric nosologists like Kraepelin and Schneider, while sociopathy is due more to the work of Partridge in the 1920s and 1930s.