Personality disorders have traditionally been considered refractory to psychological interventions. Two of the most common, and potentially harmful personality disorders are antisocial personality disorder / psychopathy, and narcissism. Although a great deal of conceptual overlap exists between psychopathy and narcissism, the empirical study of these constructs has proceeded largely independently of one another. Further complicating the discrimination of these constructs is the identification of the bi-factorial nature of psychopathy - conceptualised as primary and secondary psychopathy - as well as the identification of two distinct forms of narcissism, overt and covert. The recent resurgence of interest in the sub-clinical manifestations of these two constructs has led to the development of a number of easily administered instruments to measure each of the psychopathy and narcissism constructs, as dimensional traits, within normal populations. This has provided empirically validated and reliable instruments to further explicate these two overlapping constructs. The first of the two studies reported sought to discriminate between psychopathy and narcissism through the recharacterisation of these constructs in terms of the early maladaptive schemas outlined in Young’s early maladaptive schema theory (Young, 1999). Findings are consistent with the hypothesis that psychopathy and narcissism are discriminable in cognitive-interpersonal terms, as operationalised by early maladaptive schemas. Findings also call into question the earlier observed hierarchical structure of the Young Schema Questionnaire