He studies criminal justice policy and the economics of crime. His current research portfolio contains a mix of evaluation research and prediction projects that leverage insights from machine learning to guide the efficient allocation of scarce criminal justice resources. His past research has considered the effect of police manpower on crime, the relationship between crime and unauthorized immigration and the cost and deterrent effect of capital punishment. He is also interested in research that advances social science research methods and has written on topics such as measurement errors in observational data and cost- benefit analysis.