His research focuses on cooperation and defiance in individuals’ interactions with the justice system. Toward this end, his work has focused on topics to include emotions and crime, radicalization, procedural and restorative justice, racial / ethnic profiling (African Americans, Latinos, Muslim Americans), police / community relations (e.g., police officer as “guardian”), final statements of the condemned, and social media and criminal justice. His publications have appeared in outlets to include Criminology, Justice Quarterly, Deviant Behavior, Policing, the Journal of Quantitative Criminology, and the Harvard Executive Session on Policing and Public Safety. He is also co-editor of Envisioning Criminology: Researchers on Research as a Process of Discovery (Springer) and Race, Ethnicity, and Policing: New and Essential Readings (NYU Press).