About Us

Our Psychologists

Our psychologists maintain general clinical practices built upon extensive training and experience working in private practice, hospital, community mental health, residential treatment, education and multidisciplinary rehabilitation settings.


Dr. John VanDeursen

Dr. John VanDeursen is the Director and senior clinical psychologist at Main St. Psychological Centre (Ph.D. Clinical Psychology, University of Saskatchewan). He works with a wide range of presenting concerns and people of all ages providing both treatment (individual, couples and families) and assessment services (including psychological and psychoeducational assessments as well as third party independent psychological examinations). He particularly has a longstanding special interest working with adolescents/young adults and their families. His practice includes work in the areas of adjustment (home, school, work) mental health, addictions and relationship based difficulties; as well as work with people having sustained injuries (general injuries, complex disabilities, chronic pain, and brain injuries).

Dr. Lawrence Dong

Dr. Lawrence Dong is a Clinical and School Psychologist. He has practiced in a variety of settings from community-based agencies to institutions providing psychotherapy, psychological assessments and consultations. Client populations have included children, adolescents and adults, as well as families. Treatment issues that have been addressed are wide ranging, from mood issues and substance abuse to cultural and learning issues. Dr. Dong has had a lengthy history with high risk populations. Currently, Dr. Dong works for the school board, is in private practice and consults to children’s mental health centres.

Dr. Miroslaw Grygo

Dr. Miroslaw Grygo completed his PhD in Clinical Psychology at the University of Manitoba. He has extensive experience working with children, adolescents, and adults assisting them with a range of issues including adjustment and conduct problems, stress and anxiety related problems, depression, anger management, pain management, addictions, and effects of trauma, including PTSD. He has worked extensively with couples and families assisting them with relational issues and parenting concerns. Dr. Grygo has worked in various institutional settings including hospitals, a residential treatment facility for youth, School Board (Child Guidance Clinic), employee assistance program, federal corrections, and in private psychological practices. His assessment experience includes clinical and psychoeducational assessments, fitness for duty assessments, threat assessments, and court ordered assessments. He is registered in Ontario to practice in the areas of Clinical and Forensic Psychology.

Dr. Deborah Kerr

Dr. Deborah Kerr has worked as a Psychologist for over twenty years, in the provinces of Alberta, British Columbia, and Ontario. She earned a Ph.D. in Counselling Psychology from the University of Alberta, and then completed a one-year Postdoctoral Fellowship in Adult Mental Health and Health Psychology at Victoria Hospital in London, Ontario. Since then, she has provided psychology services in a range of settings such as hospitals, rehabilitation centres and pain programs, community clinics, and in her private practice. Most recently, she worked at Vancouver Hospital for sixteen years, in a chronic back pain clinic, inpatient psychiatry unit, and as the Clinical Coordinator of a Complex Pain Service. Throughout her career, she has been very involved in the education and training of psychology practicum students and interns.

She is currently a Registered Psychologist in Ontario, in the areas of Clinical and Health Psychology. She provides psychological assessment and treatment services for adults, including older adolescents and seniors. Common presenting problems include depression, anxiety (e.g. chronic worry, panic attacks, driving anxiety and other phobias), coping with work and/or life stresses, managing chronic health problems and chronic pain, and posttraumatic stress. She also specializes in the assessment and treatment of problems resulting from workplace injuries, motor vehicle collisions, sexual and physical assaults, and other potentially traumatic incidents.

Dr. Lesley Ruttan

Dr. Lesley Ruttan is a registered Psychologist practicing in the areas of Clinical Neuropsychology and Clinical Psychology. She received her Ph.D. in Clinical Psychology from York University. Dr. Ruttan has been a part-time staff Neuropsychologist at the Toronto Rehabilitation Institute/University Health Network (TRI/UHN) since 2002 having worked with inpatient and outpatient acquired brain injury populations. Dr. Ruttan also serves as Practice Leader for Psychology at TRI/UHN and is actively involved in the training of clinical interns. She holds an Adjunct Lecturer position at the University of Toronto Scarborough’s Graduate Department of Psychological Clinical Science.

Dr. Ruttan provides neuropsychological and psychological assessment services (including third party independent examinations) and treatment services for adults and seniors. Common presenting problems include brain injury/illness, depression, anxiety, coping with life stressors and adjustment to injury/illness/disability. She also specializes in the assessment and treatment of individuals that have been involved in motor vehicle accidents and workplace injuries.

Dr. Laura Young

Dr. Laura Young completed her Ph.D. in clinical psychology at the University of Victoria. She has worked previously in community mental health centres, university-based clinics, and psychiatric, general, and children’s hospitals. She provides therapy and assessment to adults, children, adolescents, and families presenting with a wide variety of concerns, including depression and mood issues, stress and anxiety, relationship concerns, family conflict, self-esteem issues, substance use, trauma, and attention or learning difficulties. She finds relationships to be a particularly important focus for therapy, as adjustment difficulties, mental health concerns, and unhealthy patterns can develop and be maintained in close relationships and can also be changed and improved in relationships.

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