Numerous criminologists have noted their dissatisfaction with the state of criminology. The need for a new paradigm for the 21st century is clear. However, many distrust biology as a factor in studies of criminal behavior, whether because of limited exposure or because the orientation of criminology in general has a propensity to see it as racist, classist, or at least illiberal. This innovative new book by noted criminologist Anthony Walsh dispels such fears, examining how information from the biological sciences strengthens criminology work and both complements and improves upon traditional theories of criminal behavior. With its reasoned case for biological science as a fundamental tool of the criminologist, Walsh's groundbreaking work will be required reading for all students and faculty within the field of criminology.