He earned his Ph.D. at the CUNY Graduate Center in New York City – specializing in crime analysis and crime mapping. Dr. Herrmann is a former Crime Analyst Supervisor with the New York City Police Department where he worked on crime prevention and control strategies, officer and resource allocation, and research of longitudinal crime trends throughout New York City. His current research interests include the study of crime at micro-levels using GIS and spatiotemporal relationships between businesses, neighborhood socioeconomic factors, and crime. He is currently working on violence prevention initiatives with the New York City Housing Authority research team at John Jay College of Criminal Justice, concentrating on gun violence in New York City.