About Us
When Sally Davidson and Sean Foss met, they quickly recognized their shared goal: improving patient care beyond the boundaries of conventional medicine. With this common vision, they founded Functional Medicine Collaborative to support people in achieving better health.
Today, our practice reflects Sally and Sean's commitment to reshaping healthcare. Their collaborative approach combines innovation, empathy, and expertise, making wellness more accessible and impactful. Meet the team at Functional Medicine Collaborative!
Meet Our Founders
Sally Davidson, ANP, IFMCP
Co-founder
Sally is an Adult Nurse Practitioner and a Certified Functional Medicine Practitioner.
Sally discovered Functional Medicine in 2009 after reading Dr. Mark Hyman’s book: The Ultra Mind Solution. “Dr. Hyman described everything I was trying to do within the conventional model. The book came at a time when I was feeling so disenchanted with medicine and had thought about leaving medicine altogether. It gave me hope that we could change the way we practice. “
Sean Foss, ND, LAc
Co-founder
Dr. Foss is a Naturopathic Doctor and a Licensed Acupuncturist.
Dr. Sean Foss is a native Cape Codder that has returned home to practice natural medicine. He is a graduate of the University of Bridgeport’s Naturopathic College of Medicine and Acupuncture. Dr. Foss is currently a licensed Naturopathic Doctor in the States of Massachusetts and New Hampshire and a member of the Massachusetts Society of Naturopathic Doctors.
Nutritionist
Kimberly Concra, MS, LDN
Licensed dietitian/nutritionist
Kimberly is a licensed dietitian/nutritionist with a focus on whole person well-being. Her passion for integrative and holistic health led her to the University of Bridgeport for her M.S. in Nutrition, which was taught through the lens of functional nutrition medicine. Familial experience with Celiac Disease and GI disorders have guided her to get at the root cause of health issues that impact nutritional status. She finds cooking to be healing and likes to assist people in finding foods that fit in their healing plan. Understanding that there is no one size fits all process to healing, Kimberly is interested in assisting clients to find their calm through a personalized nutrition and lifestyle plan.
Physical Therapy & Personal Training
Melissa Wynn, PT, DPT
Owner of Thrive Wellness, LLC
Melissa is a graduate of Northeastern University with a BS in physical therapy, eventually taking advantage of the bridge program at Simmons University to attain her DPT. She is currently working on her certification as a functional medicine practitioner. Melissa brings almost three decades of experience, working with (0-3 yrs) early intervention to skilled nursing facilities (100 yrs +) Melissa has a heart-centered approach to her practice; she has identified the importance of hands-on therapy but also embraces the whole body, lifestyle approach which allows her patients to take ownership of their goals and achieve lasting change.
Outside of her practice, Melissa enjoys being in nature and at the beach or on the water. She is the proud mom of five amazing kids and is deeply rooted in the Cape Cod community since 1997. Her work blends clinical expertise with compassion, creating a space where people feel seen, supported, and motivated to live their healthiest lives.
Chris Gellert, PT, MMusc & Sportsphysio, MPT, CSCS, C-IASTM, NASM-CPT
Chris is an experienced physical therapist with nearly 25 years of strong clinical and didactic experience having worked in inpatient, outpatient, home care, industrial rehabilitation, and private practice settings. Where he has been afforded the opportunity to have treated a multitude of different movement dysfunctions. These include orthopedic injuries, spinal injuries, traumatic and sport related injuries, motor vehicle accidents, post operative conditions, neuromuscular conditions, geriatric conditions, balance and other related movement dysfunctions. Chris also is a certified personal trainer with 25 years experience. Where he has trained clients young and old, helping clients safely and effectively reach their goals and optimal functional independence.
Chris received his bachelor’s degree in marketing from SUNY Plattsburgh in 1992, then after sustaining a low back injury and receiving physical therapy, decided to become a personal trainer and pursue physical therapy school. Chris attended and graduated from Nova Southeastern University (FL) in 1999. Then in 2011, Chris attended and graduated from the University of South Australia earning an advanced master’s degree in Musculoskeletal and Sports physiotherapy. which is equivalent to a U.S. Residency. When he isn’t working, he loves playing with his dogs, traveling,
mt. biking, hiking and enjoying time with his wife Ailie and his two dogs Skylar and Maylo.
Health Coach
Jenny Kelleher, RN-BSN, FMCHC
Health Coach
Jenny, a proud Northeastern University alum with a BS in Nursing, brings over eight years of experience in cardiology and emergency medicine.
Seeing the limitations of traditional medicine and the rise in chronic illness and mental health challenges, Jenny pursued a health coaching certification through the Functional Medicine Coaching Academy. Under the mentorship of Sally Davidson, she is expanding her knowledge in functional medicine to help patients make meaningful lifestyle changes. Jenny is especially passionate about teaching the mind-gut connection and sharing strategies to manage stress, empowering others to live life fully.
We also collaborate with a wide range of practitioners outside our office, all committed to assisting you on your health journey.
Alison Dwyer, APRN
Alison Dwyer is an Advanced practice Nurse (APRN) with Board Certification in Psychiatry.
As an Advanced Practice Nurse, she can assess, diagnose and treat mental health disorders including multiple forms of depression, anxiety, PTSD, ADHD and other mood-related disorders. Alison also has experience working with women specifically those in need of therapeutic support through pregnancy, postpartum or menopause.
Olga Shemanyuk, DMD
Dr. Shemanyuk has been practicing general and family dentistry since 1996 at which time she graduated with her first DMD degree from State Medical University in Kiev, Ukraine. She went on to complete a specialty program in therapeutic dentistry that covered restorative dentistry and endodontics. After gaining experience in a state dental clinic she opened her first practice in Kiev. In 2013 she earned her second DMD degree from Tufts University School of Dental Medicine in Boston. Dr. Shemanyuk has been serving patients at private practices throughout New England and the Greater Boston area including the MIT Dental Clinic in Cambridge, MA.
She believes in biosafe and holistic dentistry methods and knows full well that she is not only caring for her patient’s oral health in their dental treatment, but also for their overall health as the oral cavity is not a separate part of the body. Our overall health is a direct result of our oral health, which many people tend not to know. For her, dentistry is more than just a profession – helping people has always been her guiding principle.