Skip to main content
CRIMJ student
Master of Professional Studies in
Criminal Justice Policy and Administration


Ph.D., Criminology and Criminal Justice, University of Maryland, College Park
M.A., Sociology, George Mason University
B.A., Administration of Justice and Sociology, Penn State

Dr. Eileen M. Ahlin is an associate professor of criminal justice in the School of Public Affairs at Penn State Harrisburg. She joined the faculty in 2013 after 15 years with a private corporation, where she conducted criminal justice research at the federal, state, and local levels. Her teaching and research interests include violence, neighborhood effects, corrections, research methods, and criminological theory.

Ph.D., Criminology and Criminal Justice, University of Maryland, College Park
Certificate, University Teaching and Learning, University of Maryland, College Park
M.S., Criminal Justice Administration, Niagara University
B.A., Psychology, Keuka College

Dr. Jennifer Gibbs' research interests focus on policing topics, including violence against police, public attitudes toward police, diversity in recruitment and retention, and terrorism. Notably, her work on social distance and attitudes toward police, co-authored with Dr. Jonathan Lee, was recognized in the 2016 Emerald Literati Network Awards for Excellence. At Penn State World Campus, Dr. Gibbs typically teaches courses on policing (CRIMJ 210: Policing in America; CRIMJ 408: Police Administration) and ethics (CRIMJ 465: Ethics in Criminal Justice).

Ph.D., Public Administration and Policy, Rockefeller College of Public Affairs and Policy, University at Albany

Dr. Ahmet Guler, assistant teaching professor in the Department of Sociology and Criminology at Penn State, is director of graduate studies in criminal justice policy and administration. His research focuses on criminal justice policy, policing, terrorism, criminal justice reform, information technology in criminal justice, and transnational crime.

Ph.D., Social Science-Criminal Justice, Michigan State University
M.S., Criminal Justice, Shippensburg University
B.S., Sociology/Anthropology, Elizabethtown College

Dr. Don Hummer is co-author/editor of The Culture of Prison ViolenceHandbook of Police Administration, and the forthcoming The Technology Revolution in Criminal Justice. His work, focused primarily on offender treatment and control, has appeared in peer-reviewed outlets such as Aggression and Violent BehaviorProbation Journal, Law & Policy, and The Prison Journal.

Ph.D., Criminology, Sam Houston State University
M.A., Criminal Justice, Penn State
B.A., Economics, Hankuk University of Foreign Studies

Dr. Jonathan Lee is an associate professor of criminal justice at Penn State Harrisburg's School of Public Affairs. He specializes in quantitative research on sociology and psychology of deviance, police-public relations, and police decision-making. He is associate editor of International Journal of Offender Therapy and Comparative Criminology, a consultant to Dauphin County DA's Office and police agencies, and principal investigator of criminal justice projects funded by U.S. Department of Justice.

Ph.D., Criminal Justice, University at Albany (SUNY)
M.A., Criminal Justice, University at Albany (SUNY)
B.A., Biomedical English, Peking University Health Science Center
B.S., Psychology, Peking University

Dr. Siyu Liu has been an assistant professor of criminal justice at Penn State Harrisburg since 2016. She conducts research in policing related to police legitimacy and constitutional protections in police-citizen encounters. She also studies the Chinese death penalty and criminal desistance. She was the 2021 recipient of the Criminal Justice Administrative Records System (CJARS) Fellowship Award. At Penn State World Campus, Dr. Liu typically teaches courses on policing (CRIMJ 210: Policing in America) and criminal procedure (CJPA 820).

Ph.D., Sociology, University of Tennessee
M.A., Community Psychology and Social Change, Penn State
B.S., Sociology, Penn State

Dr. Jennifer L. Schally joined the faculty at Penn State Harrisburg in 2014 after earning her Ph.D. in sociology at the University of Tennessee. Her research interests are mainly in green criminology and crimes by the powerful, including harms to nonhuman animals. She regularly teaches courses in criminology and race and crime. Dr. Schally’s work has appeared in the Journal of Sociology and Social Welfare, the American Journal of Community Psychology, and the Journal of Interpersonal Violence. Her book, Legitimizing Corporate Harm: The Discourse of Agribusiness, was published by Palgrave in 2018.

Ph.D., Sociology, Penn State

Dr. Jeffery T. Ulmer is a professor of sociology and criminology at Penn State, and serves as associate department head. His work spans such topics as courts, criminal case processing, sentencing, and corrections, as well as criminological theory, religion and crime, and violent crime. 

Penn State World Campus Student

Ready to Learn More?

Get the resources you need to make informed decisions about your education. Request information on this program and other programs of interest by completing this form.

* required 1/3

I agree to be contacted via phone, email, and text by Penn State World Campus and affiliates. Privacy Policy. reCAPTCHA protected. Google Privacy Policy and Terms of Service.