Our Practitioners

Meet our team of experienced naturopaths and functional medicine practitioners brought together by our shared commitment to the concept of whole body health. We work together to re-establish a basis of good health for you and your whole family.
Laurie Rigg - Waterdown Clinic


Laurie Rigg is a Registered Nurse with international experience in a variety of clinical settings. As a wellness practitioner, she offers more than 30 years of health care education with a focus on the root causes of illness, lifestyle, nutraceuticals and bio-identical hormone replacement therapy. I am honoured and motivated to work with a team of like minded professionals who will partner with you on your journey to optimal health!

Dr. Mary Peric - Waterdown Clinic


After an ongoing struggle with various symptoms due to stress, poor digestion and hormonal imbalances, Mary was thrilled to discover naturopathic medicine and utilize its therapies to treat the root cause of her symptoms. By personally experiencing the benefits that simple yet powerful changes can make to one’s health, Mary gained a renewed appreciation for the healing capacity of the human body, when it is properly supported with all the necessary tools.

As a naturopathic doctor and a lactation educator, Mary focuses her practice on understanding each patient’s unique health story, identifying potential patterns of imbalance and root cause(s) of disease and developing a customized treatment plan to achieve their individual health goals. Mary truly enjoys helping her patients realize their potential for health and supporting them through their journey to recovery and health optimization.

Dr. Andrew Kiellerman, MD - Waterdown Clinic


Licensed Medical Dr specializing in Functional Medicine, Bioidentical Hormone Replacement Therapy

Dr Kiellerman employs nutrition, lifestyle coaching, nutraceuticals and Bioidentical Hormone Replacement Therapy to manage complex, chronic and debilitating symptoms that plague modern day society. Alzheimer’s Dementia, Andropause, Arthritis, Autoimmune Conditions, Colitis, Crohn’s, Graves, Hashimoto’s Thyroiditis, Hormonal Imbalances, Hypothyroidism, Low T, Lyme Disease, Menopause, Mold Toxicity, Parkinson’s, PCOS, Perimenopause Rheumatoid Arthritis are some of the many conditions that Dr Kiellerman can help you manage.

Nancy Britton - Waterdown Clinic


EDS Technician, Sensitivity Testing

Food and environmental sensitivities can have a dramatic impact on overall health. Identifying and eliminating them can be a powerful step on your healing path. EDS is painless, non-invasive, and accurate. EDS measures both histamine and non-histamine responses to substances which many tests are not able to do. Non-histamine responses are particularly important and are directly related to symptoms such as bloating, fatigue and headaches.

Nancy Britton brings many years of experience as an advanced EDS technician to the Waterdown Clinic where she has helped to customized this testing to detect food sensitivities, the presence of candida, parasites, bacteria and viruses, exposure to heavy metals, imbalance of hormones, environmental exposures and organ stress or weakness.

Please call the office at 905-690-9151 to book an appointment.

Chantal Mulhern - Waterdown Clinic


I began experiencing challenges with my health several years ago which led to my passion for “clean eating” and my love for natural medicine. Through this experience, I realized that in order to reach optimal health and wellness our mind, body and spirit must be in balance. When my own health improved, I knew I had something to share and wanted to help others feel more like themselves, just as I had done.

I hold a designation as a Registered Holistic Nutritionist from the Canadian School of Natural Nutrition and I am also a certified Live Blood Analyst (darkfield microscopy) with Microcell Sciences Inc.

Maryellen Tedeschi - Waterdown Clinic


Your health is my priority.

As a Naturopathic Doctor, my approach to health care is one that is naturally-focused and research-driven. I am passionate about empowering you to make informed decisions about your health. Your symptoms are part of a bigger picture. Asking critical questions, digging deeper, and utilizing the appropriate assessments help us to find the answers you’ve been longing for. I use a combination of clinical nutrition, supplementation (including vitamin injections), custom-compounded solutions (including bio-identical hormone therapy and natural desiccated thyroid), mind-body support, and acupuncture as part of your patient-centered treatment plan. The magic happens when we work together as a team to address your health goals, both short and long-term.

Sarah Greer


Sarah has over 15 years of experience working as an Addiction and Mental Health Therapist and Coach. She specializes in helping individuals with mental health, trauma and addiction challenges and those who want to obtain higher levels of self-love, self-esteem, peace of mind and overall well-being.

As your Personal Coach, Sarah is here to empower you and provide you with a toolkit of teachings to confidently face challenges and overcome barriers to health and wellness.

Alexandra Nowak


Your health is my priority.

Alexandra Nowak, BScN, MSc, NP-PHC or NP Alex as she is affectionately known, is a licensed Nurse Practitioner in the province of Ontario.

NP Alex holds a Certification in Advanced Bio-Identical Hormone Replacement Therapy from The Academy of Preventative & Innovative Medicine – Dr. Rouzier Worldlink Medical. This gives Alex a unique perspective in the functional/integrative medicine approach, using bioidentical hormones and lifestyle to optimize your health and vitality.

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