His research interests include the biological evolution of human traits, genetic and environmental underpinnings of human violence, and general intelligence. His published articles have appeared in PLOS One, Behavior Genetics, Developmental Psychology, Journal of Psychiatric Research, Criminology, and Social Science and Medicine as well as others. He was also a coeditor of The Nurture versus Biosocial Debate in Criminology: On the Origins of Criminal Behavior and Criminality (Sage).