Dr. Mark Petter


I am a clinical psychologist registered with the College of Psychologist of Ontario. I received my Ph.D. in clinical Psychology from Dalhousie University in 2014. Since graduating I had been employed at Victoria Hospital with the Traumatic Workplace Program until entering private practice.

My practice focuses on providing assessment and treatment to adults with a variety of physical and psychological difficulties. I work from a cognitive-behavioural perspective and I have also received training in mindfulness-based treatments, including completing professional training with Dr. Jon Kabat-Zinn. I am particularly interested in helping individual's cope with stress, injury, illness, and pain. A goal of my practice is to provide my clients with the most scientifically supported treatments available.


Dr. Nancy Davis


I am a clinical psychologist registered with the College of Psychologists of Ontario. I received my Ph.D. in clinical psychology from the University of Wisconsin-Madison in 2002 and completed my post-doctoral training at the University of Michigan in 2004. I moved to London in 2009 and I'm excited to be a part of Dr. Biederman's practice and to serve the mental health needs of the London Community.

My work with patients is grounded in the feminist principles of collaboration and respect for the individuals' own authority regarding their experience. My work includes acknowledging the interaction between the individual and the systems that the person is a part of, such as family, culture, and work environment, and how that interaction contributes to the person's lived experience. I value focusing on my patients' strengths and capacity for resilience, even though much of the work may involve engaging with areas of distress including depression, anxiety, and grief.

Heather Hargraves , MA. Counsellor


Heather Hargraves with her MA in counselling Psychology from Western University,

in London, Ontario, Canada. Her Master thesis investigated how neurofeedback can help those struggling with various forms of trauma. Heather also holds a BAH. in Philosophy from the University of Windsor Ontario. Between her degrees Heather worked as a yoga instructor, and meditation teacher. Heather's strength lies in her understanding of the neurological basis of

various mental health disorders and her ability to explain and educate how various forms of therapy, including mindfulness therapies, can be used to address specific needs. Heather is particularly interested in how neurofeedback and heart rate variability therapy can help a client move through various issues that have proven to be slow to respond to traditional talk therapies alone. Heather will be working under the clinical supervision of Dr. Tamara Biederman as she works towards her Psych Associate designation. 

Chantelle Lloyd, MSc. Clinical Psychology Resident


I am a Ph.D. Candidate in the Research & Clinical Training program at McMaster University, and I am currently completing my residency at Dr. Tamara Biederman & Associates.

I provide assessment and treatment services to adults experiencing a range of physical and psychological difficulties including anxiety and panic, depression, post-traumatic stress and moral injuries (e.g., PTSD), chronic pain, relationship difficulties, low self-esteem, substance abuse, suicidality, and other concerns.

I often work with inidividuals who are recovering from traumatic experiences, both personal and work-related. As part of this work, I regularly see first responders, public safety personnel, military members, and others experiencing ongoing occupation stress.

My approach to treatment is collaborative, integrative and suited to meet the needs of each individual client. Our work toether will draw upon a variety of methods such as cognitive behavioural therapies, somatic-based therapies, mindfulness-based therapies, internal family systems therapy, etc. I am particularly interested in how neuroscience can be used to inform clinical treatment, and I offer neuro-assisted psychotherapy using EEG Neurofeedback when appropriate and desired by the client.