His research focuses on police, intelligence, civil-military relations, and Latin American politics. Dr. Esparza is developing a book manuscript comparing the evolution of police in Chile, Colombia, Mexico, and the United States. The focus of this work investigates the correlation between organizational structures within each police system and their malfeasant practices. He currently has research projects analyzing public opinion of the armed forces and crime victimization under review. His work has been published in Comparative Political Studies and the Annual Review of Political and Military Sociology.