He founded the Penn Laboratory for Experimental Evolutionary Psychology, in 2003. He has published dozens of journal articles on a wide array of topics, including morality, cooperation, friendship, mate choice, supernatural beliefs, modularity, self-control, and other topics. He received his PhD at the University of California Santa Barbara at the Center for Evolutionary Psychology in 1998, and received postdoctoral training at Caltech in the Division of Humanities and Social Sciences, UCLA Anthropology, and the University of Arizona’s Economic Science Laboratory with Vernon Smith. In 2008, he won the inaugural Distinguished Scientific Award for Early Career Contribution from the Human Behavior and Evolution Society.