Siyu Liu, Ph.D.

Associate Professor of Criminal Justice, School of Public Affairs
Olmsted Building, W157
W157 Olmsted Bldg
Penn State Hbg
Middletown, PA 17057

Dr. Siyu Liu graduated from Peking University with bachelor’s degrees in Biomedical English and in Psychology. She obtained her master’s degree in Criminology and Criminal Justice in 2010 and a doctoral degree of the same field in 2014 from the School of Criminal Justice from University at Albany (SUNY). She specializes in quantitative research on the topics of juvenile delinquency, police legitimacy, and the death penalty in China. Her research has a comparative focus through empirical studies of China and the United States. Dr. Liu is an active member of a group of Chinese criminologists based in the U.S. and has been presenting her research projects in more than eight prestigious universities in China.

Professional Affiliations: 

  • American Society of Criminology (ASC)
  • Academy of Criminal Justice Sciences (ACJS)
  • Association of Chinese Criminology and Criminal Justice in the US (ACCCJ) URL:
  • Chinese American Professors and Professionals of Pennsylvania (CAP) [treasurer] URL:
  • Comparative Criminology
  • Juvenile Justice
  • Police Legitimacy
  • The Fourth Amendment protections

Selected recent publications. For a full list of publication, please refer to the curriculum vitae on the left rail.

 Nir, E., & Liu, S. (forthcoming). Defending the Fourth Amendment rights in an imbalanced courtroom. The Journal of Criminal Law and Criminology, 1-42. [Accepted May 2020].

Nir, E., & Liu, S. (forthcoming). What do the gatekeepers see? Perceptions and evaluations of scientific evidence among state court judges. Criminology, Criminal Justice, Law and Society, 1-16. [Accepted March 2021].

Liu, S., & Nir, E. (2021). Do the means matter: Defense attorneys’ perceptions of procedural transgressions by police and their implication on police legitimacy. Criminal Justice Policy Review, 32(3), 245-267.

Li, F., Sun, I., Wu, Y., & Liu, S. (2020). The mediating roles of law legitimacy and police legitimacy in predicting cooperation with police in authoritarian China. Australian and New Zealand Journal of Criminology, OnlineFirst Oct. 22, 2020, 1-19. DOI: /10.1177/0004865820965641

Liu, S., Wu, Y., Sun, I., & Li, F. (2020). Neighborhood context, police legitimacy, and willingness to help the police in urban China. Policing: An International Journal, 43(6), 947-962.

Wu, Y., Sun, I., Li, F., & Liu, S. (2019). Group position, consciousness, and perception of police fairness among urban residents in China. Policing: An International Journal, 42(4). 640-653.

Liu, S., Xiong, M., & Liang, B. (2019). The death penalty for foreign drug offenders in China: Legal protection and equal treatment. European Journal on Criminal Policy and Research, 25, 427-448.

Xiong, M., Liu, S., & Liang, B. (2018). Criminal defense and judicial sentencing in China’s death penalty cases. Psychology, Crime & Law, 24(4), 414-432.
Liu, S. & Liu, J. (2018). Police legitimacy and compliance with the law among Chinese youth. International Journal of Offender Therapy and Comparative Criminology, 62(11), 3536-3561.

Liu, J., & Liu, S. (2016). Are children of rural migrants more delinquent than their peers? A comparative analysis of delinquent behaviors in the City of Guangzhou, China. Crime, Law and Social Change. 66(5), 465-489.

Liu, S., Pickett, J., & Baker, T. (2016). Inside the black box: Prison visitation, the costs of offending, and inmate social capital, social ties and prisoner reentry. Criminal Justice Policy Review. 27(8), 766-790.

Liu, S. (2015). Is the shape of the age-crime curve invariant by sex? Evidence from a national sample with flexible non-parametric modeling. Journal of Quantitative Criminology, 31(1), 93-123.

M.A.; Ph.D. (SUNY)

B.A.; B.S. (Peking)

CRIMJ210 Policing in America (online and residential)
CRIMJ416 The Death Penalty (residential)
CJPA820 Criminal Procedure