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.

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She has a special interest in helping children and adults with digestive health concerns as well as helping women with their reproductive and hormonal health. She is very passionate about making the best possible choices for achieving and maintaining a healthy pregnancy, empowering labour & birth, a gentle, healing transition into the postpartum period and ensuring that children reach their optimal potential for growth and development.

When she is not with her patients, she is sharing her passion for naturopathic medicine with family, friends and those who gather at the various talks and seminars hosted within the community. She loves to educate others on complementary healthcare options and share her personal and clinical experiences as a naturopathic doctor, wife and mother.

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.

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Dr. Kiellerman has a Functional Medicine practice in Mississauga and at The Waterdown Clinic of Functional and Integrative Medicine.

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

Meghan Crewson - Waterdown Clinic


Carah has completed four years of training at the Canadian Academy of Osteopathy and is a registered member of the Ontario Osteopathic Association(OOA).

Prior to her osteopathic career, she earned an honours diploma in Health, Fitness and Wellness from Mohawk College in 2010 and has continued to work as a group fitness instructor and personal trainer specializing in post-rehabilitative training for many years. While working she continued her education in the rehabilitative field, graduating from the Mohawk-McMaster Institute of Applied Health Sciences in 2014.

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She began working with a wider range of patient populations in various healthcare settings as an Occupational therapy and Physiotherapy assistant helping patients reach their rehabilitative goals. She has a passion for helping others regain their functional mobility and engage in their lives on new and deeper levels which lead her to the classical osteopathic approach to healing, a more holistic approach that considers the whole person and not only an isolated area of the body that has been injured. She understands the body is a dynamic unit of function and as such reintegration using a whole body approach optimizes the inherent healing capacity of the body.

Carah is guided by the classical teachings of Dr. AT Still and the principles of osteopathy that translate to everyday life. She uses a gentle principles based-approach to enable the body to self-heal and self-regulate so that her patients can live their lives better.

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.

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Holistic Nutrition is an approach to health and wellness through the use of natural healing capabilities of food. Holistic Nutrition looks at the “whole” person by assessing their complete health history, dietary habits, lifestyle, detoxification needs as well as physical and emotional aspects. Connecting all these pieces can assist in determining the root cause of imbalance and therefore lead to a healthy program that would work best for the patient. The services I offer through Holistic Nutrition are to examine the foods that should be eliminated along with foods that are beneficial to your specific case. Menu plans are provided along with recipes, cookbooks and shopping lists.

Live Blood analysis is the examination of living blood under an extremely high-powered microscope. The cells are then examined to identify the current state of health. Together, we examine the state of your red blood cells, white blood cells and plasma and immediate results are provided. This measurable tool allows me to put the proper plan together for you along with nutritional coaching to maximize your overall health.

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.

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Clinical Focus

I strive to give you the tools you need to reclaim your health, so that you can live life feeling your best. I work with patients to achieve balance in the following areas:
Hormonal health (PMS, fertility support, menopause)
Thyroid conditions (Hashimoto’s, hypo- and hyperthyroidism)
Digestion (IBS, bloating, indigestion, infections)
Skin care (acne, psoriasis, eczema)

Education and Qualifications

Dr. Maryellen Tedeschi ND is a practicing member of the College of Naturopaths of Ontario (CONO) with an active Prescribing License, and a professional member in good standing of the Canadian Association of Naturopathic Doctors (CAND), the Ontario Association of Naturopathic Doctors (OAND), and the Pediatric Association of Naturopathic Physicians (PedANP). Before completing her Doctor of Naturopathy degree from The Canadian College of Naturopathic Medicine, Maryellen graduated from McMaster University with an Honours Bachelor of Science. Dr. Maryellen Tedeschi ND also has completed additional training for a qualification in Facial Rejuvenation and Cosmetic Acupuncture Treatments.

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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Alex understands that the experiences and struggles of each individual create their own unique set of needs. Her focus is to create individualized treatment for each patient and encourage them to be active participants in improving and optimizing their health outcomes.

Alex received her Bachelor of Science in Nursing (BScN) with Honours from Ryerson University in 2011 and trained at Cambridge Memorial Hospital. She holds a Master of Science in Nursing (MSc) and Primary Care Nurse Practitioner Certificate from University of Toronto.

She has additional specialty training as a Certified Addiction Specialist from the University of British Columbia and Essential Cannabis Knowledge from the University of Waterloo.

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