By Jean Marie McGloin and Kyle J. Thomas 

Peer influence occupies an intriguing place in criminology. On the one hand, there is a long line of theorizing and empirical work highlighting it as a key causal process for delinquency. On the other, there is a group of theoretical skeptics who view it as one of the most notorious examples of a spurious link. After discussing these perspectives, this review takes stock of our intellectual advancements in understanding peer influence over decades’ worth of research toward this endeavor. We conclude that although there have been important gains, essential questions and gaps remain. Toward this aim, we offer some lines of future work that we believe offer pathways to yielding the greatest added value to the discipline. 

Annu. Rev. Criminol. 2019. 2:241–64