In response to exciting developments in genetics, neuroscience and evolutionary psychology, a number of criminologists have embraced the position that criminal behaviour is the product of biological, psychological, and sociological factors operating together in complex ways. They have come to realize that if they are to capture the dynamic nature of criminal behaviour then they must span multiple levels of analysis and thus multiple disciplines. The explosion of interest in this field of biosocial criminology over the past ten years means that the time is ripe for this research companion aimed at graduate students and scholars, giving them an essential overview of the current state of research in the field. The authors are experts in a variety of disciplines (sociology, psychology, biology, criminal justice, and neuroscience), but they all have in common a strong interest in criminal behaviour. This unique book is essential and accessible reading for all students and scholars in the field.