Assistant Professor
Department of Psychology
Towson University

Principal Investigator
Site for OCD & Autism Research


Department of Psychology
Towson University
8000 York Rd.
Towson, MD 21252

(410) 704-3261 Phone
(410) 704-5874 Fax


Advanced Experimental Design I
Advanced Experimental Design II
Advanced Abnormal Psychology
Advanced Child Psychopathology
Practicum in Clinical Psychology
Internship in Clinical Psychology

Behavioral Statistics

Research Interests

  • Nature and treatment of obsessive-compulsive spectrum conditions (e.g., obsessive-compulsive disorder, hoarding disorder, body dysmorphic disorder, Tourettes syndrome and tics, and trichotillomania)
  • Nature and treatment of autism spectrum disorders, particularly higher-functioning manifestations (e.g., Asperger disorder)
  • Phenomenological overlap between the obsessive-compulsive and autism spectrums
  • Nature and treatment of anxiety disorders, including trauma (e.g., PTSD) and resultant dissociation
  • Cognitive-behavioral therapy pragmatics

If you’re visiting to learn more about the family hoarding study, please see the following study flyer.

    Selected Publications

    Martinelli, M., Chasson, G. S., Wetterneck, C. T., Hart, J. M., & Björgvinsson, T. (in press). Perfectionism dimensions as predictors of symptom dimensions of obsessive-compulsive disorder. The Bulletin of the Menninger Clinic

    He, L. Ewing, J., Shaw, A. M., Wang, J., & Chasson, G. S. (in press). A cross-sectional investigation of autogenous and reactive obsessions and associated cognitive and symptom correlates in China. International Journal of Clinical Health Psychology

    Sun, L., Wang, J., Sun, H., Dong, Z., & Chasson, G. S. (in press). Validation of a Chinese version of the obsessive beliefs questionnaire. Journal of Psychopathology and  Behavioral Assessment

    Brand, B. L., & Chasson, G. S. (in press). Distinguishing simulated from genuine dissociative identity disorder on the MMPI-2. Psychological Trauma: Theory, Research, Practice, and Policy.

    Chasson, G. S., Mychailyszyn, M. P., Vincent, J. P., & Harris, G. E. (2013). Evaluation of trauma characteristics as predictors of attrition from cognitive-behavioral therapy for child victims of violence. Psychological Reports, 113, 734-753.

    Björgvinsson, T., Hart, J., Wetterneck, C., Barrera, T. L., Chasson, G. S., Powell, D. M., Heffelfinger, S., & Stanley, M. A. (2013). Outcomes of specialized residential treatment for adults with obsessive compulsive disorder. Journal of Psychiatric Practice, 19, 1-9.

    Jarosiewicz, S., & Chasson, G. S. (2013). Social competence impairments in autism spectrum disorders. In V. B. Patel, V. Preedy, and C. R. Martin (Eds.), The Comprehensive Guide to Autism. Springer

    Chasson, G. S., Tang, S., Gray, B., Sun, H., Wang, J. (2012). Further Validation of a Chinese version of the Obsessive-Compulsive Inventory-Revised. Behavioural and Cognitive Psychotherapy, 7, 1-6.

    Wetterneck, C. T., Little, T. E., Chasson, G. S.,  Smith, A. H., Hart, J. M., Stanley, M. A., &  Björgvinsson, T. (2011). Obsessive-compulsive personality traits: How are they related to OCD severity? Journal of Anxiety Disorders, 25, 1024-1031.

    Chasson, G. S., Timpano, K. T., Greenberg. J. L., Shaw, A., Singer, T., & Wilhelm, S. (2011). Shared social competence impairment: Another link between the obsessive-compulsive and autism spectrums? Clinical Psychology Review,
    31 , 653-662.

    Chasson, G. S., Buhlmann, U., Tolin, D. F, Reese, H. E., Rowley, T., Welsh, K. S., & Wilhelm, S. (2010).  The need for speed: Accelerating OCD recovery using D-cycloserine to enhance exposure and response prevention. Behaviour Research and Therapy, 48(7), 675-679.

    Chasson, G. S., & Wilhelm, S. (2009). Habit Reversal Training. In CLP Task Force (Ed.), Common Language for Psychotherapy Procedures. Entry in

    Chasson, G. S., Vincent, J. P., & Harris, G. E. (2008).  The use of symptom severity measured just before termination to predict child treatment dropout. Journal of Clinical Psychology, 64(7), 1-14.

    Björgvinsson, T., Wetterneck, C. T., Powell, D., Chasson, G. S., Webb, S. A., Hart, J. H., Heffelfinger, S., Azzouz, R., Entricht, T. L., Davidson, J. E., & Stanley, M. A.  (2008). Treatment outcome for adolescent OCD in a specialized hospital setting. Journal of Psychiatric Practice, 14(3), 137-145.

    Chasson, G. S., Harris, G. E., & Neely, W. J. (2007). Cost comparison of early intensive behavioral intervention and special education for children with autism. Journal of Child and Family Studies, 16(3), 401-413.


    Please click on the following link to view the full curriculum vita of Gregory S. Chasson, Ph.D.

    Chasson Curriculum Vita

    Curriculum Vita

    Dr. Chasson is a tenure-track Assistant Professor in the Department of Psychology at Towson University, where he also conducts research on obsessive-compulsive disorder (OCD), autism spectrum disorders, and related conditions through his research lab, the Site for OCD & Autism Research. Dr. Chasson is also the Director of CBT Solutions of Baltimore, a private practice that specializes in the delivery of cognitive-behavioral therapy for obsessive-compulsive disorder, anxiety, and related conditions.

    Dr. Chasson attended the University of California at Santa Barbara (UCSB), where he graduated with a Bachelor of Arts in Psychology with Distinction in the Major and the Exceptional Academic Performance Award. While studying at UCSB, he carried out independent research to complete an undergraduate honors thesis, which investigated the automatic capture of visual attention from an evolutionary psychology framework. In addition, Dr. Chasson obtained several years of clinical and research experience as a Research Assistant and Respite Care Provider for the Koegel Autism Center at UCSB, as well as a Direct Care Staff for adolescents with severe autism spectrum disorders at the Devereux Foundation in Santa Barbara.

    Subsequent to completing his training at UCSB, Dr. Chasson immediately matriculated into the Child/Family track of the Clinical Psychology Ph.D. program at the University of Houston (UH) in Texas. He also obtained an academic minor in Psychological Statistics and Data Analysis. At UH, he carried out two independent research projects (i.e., Master’s thesis and doctoral dissertation) that investigated treatment outcome with child victims of trauma. He also served as the Research Coordinator for the Texas Young Autism Project, Program Coordinator for the UH Forensic Psychology Research lab, and Research Coordinator for the OCD Treatment Program at the Menninger Clinic in Houston.

    While at UH, Dr. Chasson also received extensive clinical training. He provided cognitive-behavioral therapy on a sliding-scale fee to the community through the UH Psychology Research and Services Center, where he also provided exposure-based treatment to young child victims of trauma through the Victims’ Resource Institute. Serving as a behavior therapist for the Texas Young Autism Project, he also worked with young children with autism, whom he treated with Discrete Trial Training and other Applied Behavior Analysis techniques.  Dr. Chasson completed a two-year externship at the Menninger Clinic’s OCD Treatment Program, where he provided exposure-based treatment, facilitated group therapy, and conducted psychological assessments.

    The University of Houston also provided multiple opportunities to teach. He served as a Teaching Assistant for two years in UH’s Department of Psychology. In addition, he was the instructor for an undergraduate abnormal psychology course and the lab instructor for one undergraduate research methods lab, as well as two graduate-level advanced statistics courses.

    For the final year of his Ph.D. program, Dr. Chasson moved to the Boston area and worked as a Clinical Fellow at Harvard Medical School and McLean Hospital. There he worked as a clinical intern at the Behavioral Health Partial Hospital and through the Outpatient program. He also collaborated on various research projects with the OCD Institute.

    After completing his one-year internship at McLean Hospital, Dr. Chasson received a two-year postdoctoral fellowship at Harvard Medical School and Massachusetts General Hospital, working in the OCD and Related Disorders Program as one of the Project Directors and Cognitive-Behavioral Therapists. There he directed a longitudinal family OCD study, collaborated on other research projects, and provided treatment to patients with a wide variety of obsessive-compulsive spectrum conditions (e.g., OCD, hoarding, body dysmorphic disorder, Tourette’s syndrome and tic disorders, trichotillomania, hypochondriasis, and Asperger’s disoder). After finishing up his training, Dr. Chasson moved to the Baltimore area for his Assistant Professorship at Towson University.


    If you’re visiting to learn more about the family hoarding study, please see the following study flyer.

    Dr. Chasson spearheads a research program called the Site for OCD & Autism Research (SOAR) in the Department of Psychology at Towson University. To learn more, please visit or click the SOAR logo below.