Personality disorder has been recognized as a disorder long time ago, but it has not yet been thoroughly classified. Among scientists, psychiatrists and other experts there have been numerous discrepancies concerning the diagnosis, methodological problems, and treatment methods. Because of this, the entire field has been subjected to fluctuating changes. On the basis of available classifications, this paper tried to research all the available and current information concerning personality disorders. The general overview of the characteristics,diagnosis, and treatment methods, with the special emphasis on antisocial personality disorder, has been provided. The antisocial personality disorder has been presented through case history. It was connected with the present knowledge of criminology. It also explains the differences between the psychopathic and antisocial personality disorders.This paper cites numerous studies, scientific and research papers which prove that personality disorders correspond to the abrupt changes in the society - particularly to the increase in violence.