About Us

Dr. David Marquis, DC, DACBN: A Functional Medicine Doctor

Dr. David Marquis is skilled in the functional medicine approach to evaluation and care of complex and chronic health concerns. He has a focused interest in neurodegenerative and neurodevelopmental conditions including autism spectrum, TBI, Parkinsonian tremors, dementia, Alzheimer’s, and CTE, and also has 25+ years of experience supporting patients with common metabolic conditions including endocrine-related disorders of thyroid, diabetes, and sex hormone imbalances.

Dr. Marquis continuously advances his knowledge in Functional Medicine, and Functional Neurology with over 100 hours annually of post doctorate education. He is an accomplished public speaker and writer as well as a recurring guest lecturer.

He and his wife of over 25 years are proud parents of four wonderful children.  He loves to surf, mountain bike, camp, read, spend time with his family, and play the guitar.  He is also actively involved in his community, donating his time to various organizations such as JustServe.org, Boy Scouts of America, Still Frothy Billabong Surf Contest, and as a Seminary instructor for local youth.

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Dr. Ryan McGaughey, DC, BS: A Functional Medicine Doctor

Dr. Ryan McGaughey has collaborated with Dr. Marquis for over a decade.  His approach to patient care is holistic, using a wide lens focused on musculoskeletal imbalance and pain relief as well as on neurometabolic conditions (thyroid, neurodegenerative disorders, endocrinology, concussions, etc.).  He has over 15 years of experience in treating patients of all ages, including infants, geriatric patients as well as professional and amateur athletes.  

Dr. McGaughey’s approach to chiropractic care is “Full-Scope”.  He uses all the technology, tools, and resources available to care for patients.  Musculoskeletal complaints patients present with may seem isolated to the neck, back, knees and/or shoulders but to Dr. McGaughey they are part of a broader system of interconnected and interrelated kinetic and metabolic processes occurring in the body and brain.

With his extensive experience, he realizes that suppressing symptoms will never produce a lasting healthy environment for the body, and in fact may only mask more serious underlying issues.  While providing treatment and proper guidance, he also educates his patients.  This is key in achieving their goals during their long-term optimal whole health journey as our bodies are created to be self-healing and self-regulating. 

Dr. McGaughey, DC, BS Kinesiology also owns McGaughey Health Group in Atascadero with his wife, Dr. Carolyn McGaughey, N.D.  They enjoy an active lifestyle and quality family time with their three wonderful children.

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Dr. Mandy Boyle, DC, MSc, RYT: A Functional Medicine Doctor

Dr. Mandy A. Boyle’s personal health journey inspired her to become a doctor.  Her passion is to empower others on their own unique pathway towards optimal whole health.  Having a strong foundation in scientific medical study and a background in yoga, Dr. Boyle knows the body’s systems are interdependent and intuitively strive to heal.  When treating the physical body, it is also important to understand metabolic key players that may obstruct healing.  Structural in nature or at a cellular level, Dr. Boyle’s holistic approach tips the balance towards maintaining a stable equilibrium and a thriving lifestyle.

Whether Dr. Boyle is helping her patients retain good health or is supporting them during their healing journey, she recognizes the importance of educating her patients so they can take ownership and responsibility for their health.  Health is a combination of many factors, and ultimately, everyone can direct their own outcome once comprehensive strategies are implemented. 

Dr. Boyle brings extensive experience in biomechanical analysis, rehabilitation post-injury (including sports injuries) or post-surgery, pain modalities, restoring functional movement patterns, chiropractic manipulation, and myofascial release techniques.

Mandy A. Boyle DC, MSc, BS, CHC, RYT is a Central Coast native and Cal Poly Alumni.  She enjoys spending time with her husband and two children, reading, outdoor activities, and yoga.