Dr. Jenn Deffendall, Clinical and Rehabilitation Psychologist

Dr. Jenn Deffendall, C. Psych

Dr. Jenn Deffendall is a registered Psychologist who received her Ph.D. from the University of Central Florida.

She currently works in private practice providing comprehensive assessment and treatment services in the areas of clinical and rehabilitation psychology.

Dr. Deffendall has extensive training and experience working with a range of problems including depression, anxiety, post-traumatic stress, health-related issues including chronic pain, and addictions (alcohol, tobacco, cannabis, and other substances). She primarily works within a Cognitive Behaviour Therapy (CBT) framework, with the ability to integrate elements of specialized treatments (such as Dialectical Behaviour Therapy/DBT, Motivational Interviewing/MI) as needed to ensure treatment is effective.

Dr. Deffendall’s professional background is diverse: she has trained and worked in private practice, inpatient and outpatient hospital clinics, residential treatment, community counseling and university settings. She completed her residency at the University of Chicago Medical Center.

Dr. Deffendall’s approach to treatment is warm, caring and collaborative. She builds a strong therapeutic relationship with clients, which forms the basis for working together to understand and develop the skills needed to manage difficult life problems.

Dr. Deffendall is a member of the College of Psychologists of Ontario, (CPO), the Ontario and Canadian Psychological Associations (OPA, CPA) and the Canadian Academy of Psychologists in Disability Assessment (CAPDA).

Dr. Jenn Deffendall works out of the Oakville Location

The Therapy Centre offers Therapy for Mood Disorders such as Bi-Polar, Post-Partum, Seasonal Affective Disorder and More

Mood Disorders

Anxiety Disorder Treatment in Oakville and Hamilton

Anxiety Disorders

alcohol addiction treatment therapy oakville hamilton

Substance Abuse/Addiction

  • Alcohol
  • Drug
  • Nicotine (smoking cessation)
  • Gaming
  • Video gaming
  • Sex, Masturbation, Pornography (“Sexual Addictions”)

Addictions Services

Smoking Cessation Program

Stress, Trauma, Post-Traumatic Stress, Acute Stress Therapy is available at The Therapy Centre

Trauma and Stress Related Disorders

  • Post Traumatic Stress Disorder
  • Acute Stress Disorder
  • Adjustment Disorder
Gender, Sexuality Issues, Gender Identity, Trans, Sexual Identity, LGBTQ

Gender and Sexuality Issues

  • Working with LGBTQ individuals


sleepy driver at the wheel of a car

Sleep Disorders

  • Insomnia
  • Circadian rhythm problems
Words "Pain Relief" on sign pointing left

Chronic Pain

  • Coping with illness
  • Work place injury
  • Motor Vehicle Accident
  • Short-term disability
  • Long-term disability

Chronic Pain and Rehabilitation

Bullying, Discrimination, Harassment Therapy is available at the Therapy Centre

Bullying / Discrimination / Harassment


Family Conflict Therapy is available at The Therapy Centre

Family Conflict

Grief, Bereavement or Loss Therapy is available at the Therapy Centre

Grief, Bereavement or Loss

Significant Life Change or Life Transition Therapy is available at the Therapy Centre

Life Transitions / Significant Life Changes

Perfectionism and or Procrastination Therapy is available at The Therapy Centre

Perfectionism / Procrastination

Self-Esteem Therapy is available at The Therapy Centre


Stress Management Therapy is available at The Therapy Centre

Stress Management

Relationship Issues like Separation, Divorce, Parenting through Divorce and Infertility are available at The Therapy Centre

Relationship Issues

  • Separation/divorce