Gottfredson and Hirschi,s A General Theory of Crime, Moffitt,s developmental taxonomy theory, and Caspi et al.'s Gene x Environment study are three of the most influential pieces of contemporary criminological scholarship, but even so, there has been little attempt to integrate and empirically assess these three perspectives simultaneously; this article addresses this gap in the literature by analyzing phenotypic and genotypic data from the National Longitudinal Study of Adolescent Health (Add Health).