This ebook on Pathological offending contains six distinct papers. Common themes emerge in understanding the etiology and course of severe antisocial conduct and pathological offending. It is clear that temperamental deficits of particularly low effortful control and high negative emotionality are potent distal predictors of antisociality. Various adverse childhood experiences, particularly sexual abuse, is also recurrent in the lives of serious offenders and appears to inform the sequela associated with severe sexual violence. And the studies show the heterogeneity of the criminal population even within relatively enriched samples of the most serious, chronic, and violent persons.