Welcome
Dr. Katie Stewart is a clinical psychologist. She works at Ontario Shores Centre for Mental Health Sciences as a clinical consultant, providing consultation and training to allied health professionals at the Ontario Structured Psychotherapy Program. She also provides private assessment and treatment at Nellie Health.
Dr. Stewart has expertise in the treatment of anxiety, post-traumatic stress, obsessive-compulsive, and mood disorders. Dr Stewart is a Quality-Rated Cognitive Processing Therapy provider. She has extensive training in the delivery of Cognitive Behavioural Therapy for a variety of conditions. Dr. Stewart also works with clients who have experienced workplace injury, including first responders and Public Safety Personnel.
Dr. Stewart is currently involved in a clinical trial examining the effect of psilocybin integrated massed cognitive processing therapy for chronic PTSD through St. Michael’s Hospital in Toronto. Dr. Stewart is also engaged in consulting work at Palo Alto University.
Background
Dr. Stewart graduated with her PhD in Clinical Psychology from Toronto Metropolitan University (TMU, formerly Ryerson University) in 2022. She completed her pre-doctoral psychology residency at St. Joseph’s Healthcare Hamilton. During her graduate training she was the recipient of the Canadian Institute of Health Research (CIHR), Frederick Banting and Charles Best Canadian Graduate Scholarship at both the Doctoral and Masters level, as well as the Ontario Graduate Scholarship. She was awarded multiple grants to fund research projects and program activities. She has 10 peer-reviewed publications, in addition to book chapters and conference presentations.
Publications
• Zheng, S., Marcos, M., Stewart, K.E., Szabo, J., Pawluk, E., Girard, T. A., & Koerner, N.
(2022). Worry, intolerance of uncertainty, negative urgency, and their associations to paranoid
thinking. Personality and Individual Differences, 186(Part A), 111382.
• Henderson, L.C., Stewart, K.E., Koerner, N., Rowa, K., McCabe, R.E., & Antony, M.M. (2022).
The relationship between religiosity, spirituality, and obsessive-compulsive disorder-related
symptoms in clinical and nonclinical samples. Psychology of Religion and Spirituality, 14(2),
208-221.
• Cupid, J., Stewart, K. E., Sumantry, D., & Koerner, N. (2021). Feeling safe: An investigation of
excessive worriers’ detection and use of safety cues presented in uncertain everyday scenarios.
Behaviour Research and Therapy, 147, 103973.
• Malivoire, B.L., Stewart, K.E., & Koerner, N. (2021). Negative urgency in individuals high in
chronic worry: A preliminary qualitative analysis. Behaviour Change, 38(2), 119-134.
• Stewart, K. E., Antony, M. M., & Koerner, N. (2021). A randomized experimental analysis of
the attention training technique: Effects on worry and relevant processes in individuals with
probable generalized anxiety disorder. Behaviour Research and Therapy, 141, 103863.
• Sumantry, D., & Stewart, K. E. (2021). Meditation, mindfulness, and attention: A Meta-
Analysis. Mindfulness, 12, 1332-1349.
• Stewart, K. E., Sumantry, D., & Malivoire, B. (2020). Family and couple integrated cognitivebehavioural
therapy for adults with obsessive-compulsive disorder: A meta-analysis. Journal of
Affective Disorders, 277, 159-168.
• Malivoire, B. L., Stewart, K. E., Tallon, K., Ovanessian, M., Pawluk, E. J., & Koerner, N. (2019).
Negative urgency and generalized anxiety disorder symptom severity: The role of self-reported
cognitive processes. Journal of Personality and Individual Differences, 145(15), 58-63.
• Lenton-Brym, A.P., Stewart, K.E., Coyne, A.E., Westra, H.A., Constantino, M.J., & Antony,
M.M. (2019). Can self-report measures of readiness for change and treatment ambivalence
predict outcomes in cognitive-behavioral therapy for generalized anxiety disorder? Journal of
Cognitive Psychotherapy, 33(4), 301-319.
• Krause, K.L., Stewart, K.E., Cassin, S.E., & Antony, M.M. (2018). Clinical perfectionism,
dissatisfaction with standards, and raising the bar: Validation of the Response to Goal
Achievement Scale. Journal of Cognitive Psychotherapy, 32(4), 241-262.