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Founder and Director of Change Clinic

Dr. Margus Heinmaa, PhD., C.Psych. is the Founder and Director of Change Clinic (est. 2012).  He is a Registered Psychologist with the College of Psychologists of Ontario and received his education and training at the University of Toronto, University of Helsinki (magna cum laude), and University of Guelph.  He holds a PhD in Clinical Psychology and has over 20 years of experience working as a clinician and researcher with adults, adolescents, and children suffering from eating disorders, depression, anxiety, substance abuse, and personality disorders.  

He received his predoctoral training at the Centre for Addiction and Mental Health (CAMH), the Toronto General Hospital (UHN), and The Hospital for Sick Children (SickKids), where he is currently a Clinical Psychologist in the Departments of Psychology & Psychiatry.  

Dr. Heinmaa has published in the areas of eating disorders, anxiety, and depression.  His current research interests include: motivation and treatment resistance, predictors of treatment outcome, revisions to DSM5 diagnostic criteria for anorexia nervosa and other eating-related disorders, and schema therapy/schema mode treatment of maladaptive patterns of thinking, feeling and behavior in adolescents and young adults.


Clinical and Health Psychologist

Dr. Catherine Munns, Psy.D., C.Psych is a licensed Clinical and Health Psychologist and is a Registered Psychologist with the College of Psychologists of Ontario. She received her doctorate in clinical psychology at James Madison University, completed her predoctoral internship at Denver Health Medical Center, completed two postdoctoral fellowships in the U.S. with a focus on pediatric health psychology. She brings a breadth of experience, having worked in a number of diverse and well-respected universities and hospitals.

Dr. Munns works with children, adolescents and adults who experience a range of mental health concerns including anxiety and mood difficulties, low self-esteem, as well as relationship issues. She also has expertise related to sleep difficulties, adjustment issues, and transitions. She has a special interest in providing therapy to individuals experiencing challenges in adjusting to and coping with chronic illnesses. She currently works at the Hospital for Sick Children (SickKids). 

Dr. Munns believes in providing evidence-based treatment tailored to her clients’ unique needs. She has a compassionate and caring attitude that focuses on building upon her clients’ strengths, while empowering them to make meaningful change. Dr. Munns draws from a variety of evidence-based approaches including cognitive behavioural therapy (CBT), acceptance and commitment Therapy (ACT), schema therapy, dialectical behavioural therapy (DBT), and interpersonal process therapy (IPT).   


Registered Dietician

Jaimie Kennedy, RD has specialized in disordered eating, eating disorders, and those who struggle with body image. Always interested in nutrition and the complex relationship many people have with food, Jaimie graduated with a Bachelor of Applied Science in Food & Nutrition at Ryerson University in 2000. After completing the dietetic internship program at the Hospital for Sick Children in 2001, she practiced in a variety of settings before settling into a position as a clinical dietitian in the Eating Disorders Program at SickKids. She has worked in inpatient, outpatient and day program settings, where she was responsible for nutrition assessments, meal planning and nutrition education.  For over 15 years, she has provided patient care, contributed to program development, participated in and published research studies, presented at conferences across the country and provided education to practitioners close to home and around the world. Combining years of experience, highly developed intuition and a deep level of understanding, Jaimie strives to work with individuals and families and help people overcome disordered eating through personalized nutritional counseling.


(currently on leave)

Dr. Marysia Lazinski PhD., CPsych is a licensed Psychologist registered with the College of Psychologists of Ontario who works with adults, young adults, adolescents, children, parents and families.

She completed her Ph.D. through the University of Victoria’s CPA-accredited Clinical Lifespan Psychology program, and she holds a Master’s in Developmental Psychology from the University of Waterloo. Her research has focused on promoting children’s resilience and coping with family conflict and divorce. She has received pre- and post-doctoral training at McMaster Children’s Hospital (MCH) / Hamilton Health Sciences (HHS), the Children’s Hospital of Eastern Ontario (CHEO) and, most recently, the Hospital for Sick Children (SickKids), as well as various community mental health and psychology practices across BC and Ontario.

Dr. Lazinski has a passion for helping clients with mental health struggles such as depression, suicidality and self-harm, anxiety, trouble coping with traumatic experiences, disordered eating, relationship and family problems, as well as general life stressors and transitions. Depending on the problem, Dr. Lazinski can help a client individually, work with the entire family (or some of its members), or simply provide training and support to the caregiver(s) of a child.

Dr. Lazinski’s approach is collaborative and individualized, though her main focus is always developing a strong therapeutic relationship as the foundation for change and growth. She draws from evidence-based treatments including, family therapy, cognitive behavioural therapy (CBT), dialectical behavioural therapy (DBT), mindfulness, acceptance and commitment therapy (ACT), and Emotion-Focused Therapy (EFT). Dr. Lazinski also has extensive experience providing psychological assessments (including, psychodiagnostic, psychoeducational, developmental and psychovocational assessments).


Intake Coordinator

Sarah will be pleased to respond promptly to your inquires about setting up an appointment at Change Clinic and all other administrative inquires!

About Us: Team Members
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