Hung earned a Ph.D. in Criminal Justice from the State University of New York at Albany. He has a M.A. in Criminal Justice from the State University of New York at Albany, and a B.A. in Psychology, University of Belgrano (Argentina). Before joining the John Jay College of Criminal Justice in 2006, Hung previously served as the Director of Research at the Kings County District Attorney's Office (1996-2001) and as a Research Associate at the National Center for Addiction and Substance Abuse at Columbia University (2001-2006). His research revolves around corrections and rehabilitation, police, and the comparative study of crime and justice. He has published about these issues and participated in related training and technical assistance activities in Latin America, Asia, and the United Nations. Professor Sung is currently examining the results of police shootings of civilians with the support of PSC CUNY (2017-2018) and collaborating with psychologists from the Autonomous University of Madrid, Spain to assess the validity and reliability of self-service tests based in tablets with financing from Banco Santander (2017-2019). He is an expert instructor in police reform in an executive training program co-sponsored by John Jay and the University of Chile with funding from the Inter-American Development Bank (2017-2020). Additionally, he is a member of the team led by Professor Jeff Melow to improve overcrowding in prisons in El Salvador with the support of the Bureau of International Narcotics and Law Enforcement Affairs (INL) of the US Department of State (2017-2019). In 2018, Professor Sung was appointed to lead a capacity development program sponsored by the United States Agency for International Development (USAID) to promote evidence-based practices in El Salvador, Honduras, and Guatemala (2018-2020).