You are now in the main content area

Dr. David Day, C.Psych.

EducationPhD, University of Windsor
Phone416-979-5000 ext. 557104
Areas of Expertisechildren’s mental health; delinquency; criminal careers; physical restraints

  Curriculum Vitae / PDF fileClick Here to View >



Dr. Day entered the applied social psychology graduate program (community psychology stream) at the University of Windsor in 1982, with a particular interest in community mental health and psychosocial rehabilitation.  His doctoral work focused on psycho-epistemology as a predictor of attitude change. 

In 1989, he became Director of Research and Evaluation at Earlscourt Child and Family Centre (now the Child Development Institute) in Toronto.  Earlscourt specialized in the treatment of children, ages 6 to 11 years, with conduct problem behaviours.  His research focused on the factors that contribute to an early onset of antisocial behaviour, including those behaviours that would be criminally chargeable if the child was over age 12 years.  This led to an interest in developmental criminology and work as a staff psychologist at a medium security prison for adult male offenders, prior to becoming a faculty member at Ryerson University in 1998.

At Ryerson, he has continued to pursue his dual interests in developmental criminology and children’s mental health. He is the Director of the Psychology of Criminalized and Risky Behaviours Lab (PoCRB Lab). One of his major programs of research was a longitudinal investigation of developmental risk factors and criminal trajectories in a sample of 764 male offenders. This project also involved an investigation of the longitudinal costs of crime. On this topic, he published his book Criminal trajectories: A development perspective, with Dr. Margit Wiesner in 2019. A second study examined the impact of a school-based program for students in grades 9 and 10 on stress and coping. He particularly enjoys research at the community-level and has been fortunate to be able to continue this work with various agencies and organizations.

Dr. Day’s teaching activities at Ryerson parallel his research interests and have included Advanced Social Psychology Seminar, Advanced Clinical Psychology Seminar, Social Psychology, Developmental Psychopathology, Community Psychology, and Introductory Psychology.


Selected Publications

Note: “*” designates with a graduate student

Day, D. M., & Wiesner, M. (2019). Criminal trajectories: A developmental perspective. New York, NY: New York University Press.

Day, D. M. & Koegl, C. J. (2019). The monetary costs of criminal trajectories for a sample of offenders in Ontario. Journal of Developmental and Life Course Criminology, 5, 203-21.

Koegl, C. J. & Day, D. M. (2019). The monetary costs of crime for a sample of offenders in Ontario. Canadian Journal of Criminology and Criminal Justice, 61, 21-44.

Day, D. M., Wilson, H.*, Bodwin, K.*, & Monson, C. M. (2017). Change in Level of Service Inventory – Ontario Revised (LSI-OR) risk scores over time: An examination of overall growth curves and subscale-dependent growth curves. International Journal of Offender Therapy and Comparative Criminology, 61, 1606-1622.

Tremblay, M*., Sutherland. J.*, & Day, D. M. (2017). Fatherhood and delinquency: An examination of risk factors and offending patterns associated with fatherhood status among serious juvenile offenders. Journal of Child and Family Studies, 26, 677-689.

Day, D. M., Wilson, H., Bodwin, K.*, & Monson, C. M. (2015). Change in Level of Service Inventory – Ontario Revised (LSI-OR) risk scores over time: An examination of overall growth curves and subscale-dependent growth curves. International Journal of Offender Therapy and Comparative Criminology, 1-17. Available online.

Newman, J. E., Wanklyn, S. G., Ward, A. K., Cormier, N. S., & Day, D. M. (2015). Developmental predictors distinguish sexual offending, violent offending, and versatile violent offending in adulthood, Journal of Sexual Aggression21, 290-302.

Nielsen, J. D., Rosenthal, J., S., Sun, Y., Day, D. M., Bevc, I., & Duchesne, T. (2014). Group-based criminal trajectory analysis using cross-validation criteria. Communications in Statistics: Theory and Methods43, 4337-4356.

Day, D. M., Wanklyn, S. G., Yessine, A. K. (2014). A review of terminological, conceptual, and methodological issues in the developmental risk factor literature for antisocial and delinquent behavior. Child and Youth Care Forum43, 97-112.

Stephens, S. & Day, D. M. (2013). Distinguishing among weapons offenders, drug offenders, and weapons and drug offenders based on childhood predictors and adolescent correlates. Criminal Behaviour and Mental Health23, 177-190.

Day, D. M., Hart, T. A., Wanklyn, S. G., McCay, E., Macpherson A., & Burnier, N. (2013). Potential mediators between child abuse and both violence and victimization in juvenile offenders. Psychological Services10, 1-11.

Wanklyn, S.G., Day, D. M., Hart, T. A., & Girard, T. (2012). Cumulative childhood maltreatment and depression among incarcerated youth: Impulsivity and hopelessness as potential intervening variables. Child Maltreatment17, 306-317.


Professional Affiliations

  • Ontario Psychological Association (OPA)
  • Canadian Psychological Association (CPA)
  • American Psychological Association (APA)