Psychopathy was the first personality disorder to be recognized in psychiatry. The concept has a long historical and clinical tradition, and in the last decade a growing body of research has supported its validity. 1, p 28 I n the decade following this 1998 statement, the theoretical and empirical literature on psychopathy has expanded virtually at an exponential rate, with the addition of well over 500 scientific publications and many books and edited volumes. Much of this literature examines and evaluates the application of psychopathy to the mental health and criminal justice systems, 2-4 where it has been described as "the most important and useful psychological construct yet discovered for criminal justice policies" 5, p 231 and as "what may be the most important forensic concept of the early 21st century." 6, book jacket However, the past few years have also seen a dramatic increase in basic research based on the theories and methodologies from basic science including, but certainly not limited to, behavioural genetics, developmental psychopathology, cognitive-affective neuroscience, biochemistry, general personality theory, 7 and organizational psychology. 8 In 2004, the SSSP was established as a vehicle for the exchange of ideas and research findings among international investigators. Because psychopathy is associated with so much social and personal damage and distress, the basic and applied research endeavours are now