His research interests include spatial patterns of crime, public health and their intersection. His work has included spatial examinations of police use of force; stop, question and frisk, as well as his recent work examining spatial distributions of drug use, fear of crime and health problems in Baltimore City, Maryland. His work has been published in such journals as Research in Crime and Delinquency, Quantitative Criminology and Justice Quarterly. He serves as a senior research fellow at the Center for Evidence Based Crime Policy at George Mason University .