Our Team

Dr. Heather Hood

Psychologist, Clinic Director

Dr. Hood is a Clinical Psychologist registered with the College of Psychologists of Ontario (CPO). She provides clinical assessment and evidence-based therapy for a range of emotional and adjustment related difficulties, with a primary focus on the treatment of anxiety, insomnia, and perinatal mood and anxiety difficulties. She primarily works from a Cognitive Behavioural Therapy (CBT) framework, and also incorporates Acceptance and Commitment Therapy (ACT), Dialectical Behaviour Therapy (DBT), and Motivational Interviewing (MI) treatments when indicated.

Dr. Hood has received specialized training and has expertise in treating anxiety, obsessive-compulsive (e.g., OCD, trichotillomania, skin picking), insomnia, depression and bipolar, and trauma-related (i.e., PTSD) disorders. Other areas of clinical interest include stress, health anxiety, and emotion regulation difficulties.

Dr. Hood holds adjunct faculty appointments with McMaster University and the University of Waterloo. She provides supervision to psychiatry residents, psychologists during their supervised practice phase, and allied health professionals looking to increase their proficiency in delivering evidence-based therapies. She enjoys teaching and has taught in undergraduate and graduate psychology programs, college degree programs, and undergraduate medical education. She has also provided engaging and comprehensive training, workshops, and consultation to organizations, including Addiction Services for York Region, Guelph Family Health Team, and the Homewood Health Centre.

Dr. Heather Hood received her Ph.D. in Clinical Psychology from Ryerson University and completed her pre-doctoral residency at St. Joseph’s Healthcare Hamilton, where she received specialized training in inpatient and outpatient mood and anxiety disorders, and health psychology. She has worked as a staff psychologist at the Homewood Health Centre in Guelph, and in various inpatient, outpatient, and consultative roles. She has authored a number of peer-reviewed journal articles and book chapters in the area of anxiety disorders and their treatment, and she has presented her research at several national and international conferences.

Dr. Samantha Kelleher


Dr. Kelleher is a Psychiatrist registered with the College of Physicians and Surgeons of Ontario. She provides psychiatric assessment focusing on diagnosis and treatment recommendations. Assessments are provided in consultation with primary care providers (physicians, nurse practitioners, and physician assistants) in the community and recommendations are provided to the primary care providers with the aim to deliver the most appropriate mental health care to individuals referred. Short term psychiatric care may be provided if indicated. Dr. Kelleher has practiced in a variety of clinical settings in British Columbia, Manitoba, and Ontario. This has included providing outpatient and inpatient care in eating disorders, outpatient general psychiatry, inpatient care and emergency psychiatry. She has served in Medical Director roles for the Eating Disorders Program in Vancouver BC as well as the Psychiatric Intensive Care and Centralized Psychiatric Consultation Service for Adults in Winnipeg Manitoba. Dr. Kelleher moved to Ontario in 2017 and worked at Homewood Health Centre in the role of Chief of Psychiatry-Specialized Elective Programs before joining Dr. Hood at Guelph CBT.

Dr. Kelleher has been active in teaching in BC and Manitoba. This has included lecture-based sessions as well as clinically based teaching and supervision. She has held academic positions including Clinical Assistant Professor in the Department of Psychiatry and Year Three Director for Undergraduate Psychiatry at UBC; Assistant Professor in the Department of Psychiatry and Associate Dean for Professionalism and Diversity in the Max Rady School of Medicine, University of Manitoba. Dr. Kelleher was a Deputy Registrar with the College of Physicians and Surgeons of British Columbia between 2011 and 2013. Her areas of interest and expertise are mood and anxiety disorders, post traumatic stress disorder, and eating disorders. Dr. Kelleher completed medical school and residency at the University of Manitoba in Winnipeg. She subsequently completed additional training in eating disorders and physician health in Vancouver BC.

Dr. Michel (Mike) Thibodeau


Dr. Michel (Mike) Thibodeau is a clinical psychologist and member of the College of Psychologists of Ontario. His practice focuses on the assessment and treatment of adults with anxiety-related disorders such as obsessive-compulsive disorder, panic disorder, generalized anxiety disorder, phobias, posttraumatic stress disorder, social anxiety disorder, and illness anxiety disorder. He is committed to delivering efficient evidence-based treatment using cognitive behavioural therapy guided by current research on best practices and complementary treatments (e.g., mindfulness, motivational interviewing). His pragmatic skills-based approach is paired with a collaborative therapeutic style to empower his clients to make lasting changes.

Dr. Thibodeau was granted his Ph.D. in Clinical Psychology from the University of Regina. He received specialized training in cognitive behavioural therapy during his residency in the Vancouver Coastal Health program and at sites in several Canadian provinces, the United States, and Australia. He has also received several awards in recognition of his contributions, has published numerous peer-reviewed articles relating to anxiety, and has had the pleasure of writing several chapters within handbooks and textbooks on cognitive behavioural therapy. Prior to working at Guelph CBT, Dr. Thibodeau was a staff psychologist at Toronto General Hospital, an Assistant Professor of Psychiatry at the University of Toronto, and an associate at CBT Associates in Toronto.

Melissa Lowe

Social Worker

Melissa Lowe is a registered social worker with the Ontario College of Social Workers and Social Service Workers (OCSSW) and the Ontario Association of Social Workers (OASW). She received her Masters of Social Work Degree from Wilfrid Laurier University, an Addictions Careworker Diploma from McMaster University and a Bachelor of Psychology Degree from Wilfrid Laurier University. She adapts her approach to each client using evidence-based therapies including Cognitive Behavioural Therapy (CBT), Dialectical Behaviour Therapy (DBT), Emotionally Focused Therapy (EFT) and Motivational Interviewing (MI).

Melissa supports individuals over the age of 18 struggling with depression, anxiety, relationship issues, family dynamics and addiction. Melissa has experiencing working in outpatient mental health/addictions as well as inpatient residential treatment.

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Stephanie Brien

Social Worker

Stephanie Brien is a registered social worker with the Ontario College of Social Workers and Social Service Workers (OCSSW) and the Ontario Association of Social Workers (OASW).  She received her Masters of Social Work Degree from the University of Toronto and a Bachelor of Social Work Degree from Kings College, University of Western Ontario.  She provides evidence based therapies which include: Dialectical Behaviour Therapy (DBT), Cognitive Behavioural Therapy (CBT), Motivational Interviewing (MI), and Cognitive Processing Therapy (CPT).   Ms. Brien’s approach to therapy is collaborative and supportive.  She hopes to create a safe place where clients can be supported in combining client strengths with evidence based treatment.

Ms. Brien has recived specialized training in Cognitive Processing Therapy (CPT) which focuses on trauma symptoms (PTSD), also has expertise in treating eating disorders, anxiety and depression.  Ms. Brien has had experience working in outpatient mental health settings, secure custody/treatment, school board and inpatient residential treatment.  Her other areas of interest include:  adolescent behavior, health/wellness, and mindfulness.

Brittany Lorentz

Office Manager

Brittany is an aspiring clinical psychologist and the office manager at Guelph CBT. She is the first person you will see when you walk into our office. Brittany has an undergraduate degree in psychology and has worked with youth and adults with mental health difficulties and developmental disabilities. Brittany helps with all office inquires, from managing referrals, scheduling new and existing clients, and working behind the scenes to make sure that our office runs smoothly. She is onsite and available to help Tuesday through Friday from 9am to 1pm.