Meet Dr. Sébastien Dewez

Services are offered in person or virtually (when clinically appropriate).

Hi, I’m Dr. Sébastien Dewez. I am a health and clinical psychologist offering psychological assessments, individual therapy, and couples therapy for adults in both English and French. My goal is to create a space where you feel understood and supported as you work through life’s challenges.

In my practice, I work with adults, older adults, couples, members of the LGBTQ2+ community, and first responders. I combine thoughtful, constructive dialogue with evidence-based approaches, so that our work together is both personal and meaningful. I believe the therapeutic relationship to be central to this process, and I take the time to understand your story, your concerns, and your values, while supporting your psychological well-being.

You may be navigating anxiety, depression, trauma, relationship difficulties, life transitions, or the emotional impact of physical health concerns. Whatever brings you to therapy, my aim is to help you better understand yourself, develop effective coping strategies, and move toward meaningful, lasting change. I use an integrative approach, which means I tailor our work to your needs, goals, and pace.
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I earned my Doctorate in Clinical Psychology from the University of Montreal and my Master’s degree in Counselling Psychology from McGill University. I am registered as a Clinical Psychologist with the College of Psychologists and Behaviour Analysts of Ontario. Before becoming a psychologist, I earned a Bachelor of Pharmacy degree and worked as a pharmacist for more than 20 years. This experience helps me understand the close connection between physical and mental health, including how medical concerns, medications, and life changes related to health can affect emotional well-being.

I also bring more than ten years of experience in clinical psychology, including work in mental health and health psychology at Montfort Hospital and The Ottawa Hospital. This background has shaped the way I support clients with both the psychological and physical dimensions of well-being.

My practice draws on several evidence-based approaches, including psychodynamic therapy, intensive short-term dynamic psychotherapy, transference-focused psychotherapy, mentalization-based therapy, emotion-focused therapy, cognitive behavioural therapy, and dialectical behaviour therapy. Together, we will work at a pace that feels right for you, with the aim of fostering greater self-understanding, strengthening resilience, and developing practical strategies to support your well-being.

Concerns I Can Help With:

• Adjustment difficulties, stress management, and life transitions
• Emotion regulation and anger management
• Anxiety disorders
• PTSD, complex trauma, and relational trauma
• Depression and mood disorders
• Weight, body image, and self-esteem difficulties
• Older adult concerns, including memory and cognitive changes, early dementia, and caregiver support
• Grief and palliative care
• Health psychology, pain management, and coping with chronic or medical conditions, such as cancer, heart and lung conditions, and diabetes
• Personality-related difficulties and personality disorders
• Psychotic disorders
• Relationship and interpersonal difficulties
• Sexuality and gender diversity

Therapy Approaches:

• Integrative therapy
• Attachment-based therapy
• Psychodynamic psychotherapy, including Intensive Short-Term Dynamic Psychotherapy, Mentalization-Based Therapy, and Transference-Focused Psychotherapy
• Dialectical Behaviour Therapy
• Emotion-Focused Therapy
• Cognitive Behavioural Therapy
• Experiential and process-oriented therapy
• Mindfulness-based therapy
• Trauma-informed therapy

Assessments:

• Diagnostic clarification, including concerns related to anxiety, mood disorders, trauma/PTSD, and personality-related difficulties
• Attention-Deficit/Hyperactivity Disorder assessment
• Collaboration with primary care providers and other healthcare professionals, when appropriate and with your consent, to support integrated care

Fees:
Please note: I exclusively provide therapy and assessment for adults (18+).

• Individual Therapy (50-minute session): $250
• Couples Therapy (50-minute session): $280
• Psychodiagnostic Assessment:
  • Clinical diagnostic clarification (no cognitive or ADHD testing involved): $2,000+ (depending on clinical needs and the time required; includes a comprehensive clinical interview, psychological testing, scoring, file review, collateral information from your primary care provider [if applicable], interpretation and case formulation, report writing, and a feedback session). Payment is due in full following the assessment session.
  • ADHD assessment/Clinical diagnostic clarification: $2,750+ (depending on clinical needs and the time required; includes a comprehensive and structured clinical interview to assess ADHD and rule out alternative or co-occurring diagnoses, psychological testing, scoring, file review, collateral information from an informant and/or your primary care provider [if applicable], interpretation and case formulation, report writing, and a feedback session). Payment is due as follows: 50% after the structured clinical interview, 25% after the testing session, and 25% after the feedback session.