Meet our Team
Dr. Jen Riegle
Naturopathic Doctor
Dr. Jen Riegle is a licensed Naturopathic Doctor, with a degree from Bastyr University, a leading institution in natural medical care and research. She holds advanced certification and training in environmental medicine, infectious disease, gastrointestinal disease, women's health, infertility, and traditional medicine practices.
Dr. Riegle is passionate about medicine and deeply values connecting with each of her patients. She blends her expertise as a diagnostician in both Western and traditional medicine, with compassion and intuition, to create comprehensive treatment plans that support physical, mental, emotional, and spiritual healing.
Her approach to healing includes a balance of physical medicine, biofeedback, meditation, hydrotherapy, supplemental and herbal medicine, spiritual practices, and conventional methods such as lab testing, medications, and diagnostic imaging.
Beyond patient care, Dr. Riegle is a leader in disaster response healthcare. She is the co-founder and Medical Director of the Integrative Healers Action Network (IHAN), a non-profit that brings integrative medicine practitioners into communities impacted by disaster. Additionally, she is the Program Director for Wild Oak Medicine’s cutting-edge first responder treatment programs, supporting those who serve on the front lines.
When not with patients, you'll likely find Dr. Riegle spending time with friends and family, dancing, being outdoors, in ceremony, cooking, traveling, or attending retreats with her spiritual mentors.
Dr. Riegle is a 2025 recipient of the Physician of the Year Award from the American Association of Naturopathic Physicians, and a 2018 and 2025 award recipient of the Champion of Naturopathic Medicine Award from the California Naturopathic Doctors Association.
Dr. Riegle’s Hours—
Tuesday/Thursday 9:45-3:15 and Wednesday from 9:45-5
For Dr. Riegle’s Rates Please Click Here.
Dr. Chris Holder
Naturopathic Doctor
Dr. Chris Holder is a naturopathic doctor who offers holistic integrative medical care with a specialized focus on treating cancer and neurological disorders. He combines the best of Western medical technology with Eastern philosophy in addressing ailments in body, mind, and spirit. Self-discovery and patient empowerment are values he holds in high regard. He practices utilizing unique combinations of treatment modalities from around the world to promote wellness and encourage healing.
Treatment options include: herbal medicine, orthomolecular medicine, IV nutrients, cognitive behavioral counseling, cranio-sacral therapy, massage, nutrition counseling, meditation, qigong, and indigenous rituals.
Dr. Holder has a special interest in the treatment and prevention of breast cancer. He will be exploring the environmental causes of breast cancer and developing treatment strategies to prevent breast cancer based on the latest in scientific research.
Dr. Holder works with all cancers and neurological disorders. His workup investigates what the likely causative factors are and directs treatment around these factors.
Dr. Holder co-owns at Wild Oak Medicine in Santa Rosa, CA and is a volunteer doctor with Integrative Healers Action Network.
Dr. Holder attended Seattle University, earning his degree in biology with a minor in chemistry. Upon graduating he conducted research on HLA genetics in Type I Diabetes Mellitus at Pacific Northwest Research Institute. He went on to receive a doctorate in Natural Medicine and masters in Acupuncture from Bastyr University. Dr. Holder spent several years developing a successful practice in Seattle, WA where he was named a Seattle Metropolitan Magazine 2010 top doctor.
Dr. Holder relocated to Sonoma County in 2013 to be closer to friends and family. Dr. Holder served as President of the California Naturopathic Doctors Association Board from 2018-2020. Sonoma Magazine has named Dr. Holder as one of Sonoma County Top Doctors in 2016. Recently Dr. Holder was recently named Best Naturopathic Doctor in Bohemian’s Best of the North Bay 2025 and Physician of the Year Award from the American Association of Naturopathic Physicians.
Dr. Holder’s Hours—
Monday, Tuesday, Thursday from 10-5.
For Dr. Holder’s Rates Please Click Here
Dr. Melissa Barber
Naturopathic Doctor
Dr. Melissa S. Barber, ND, MSc, E-RYT 500, NTP is passionate about helping patients move beyond symptom management to true healing. She takes a whole-person, multi-system approach—connecting the constellation of symptoms to diagnose and treat root causes. Dr. Melissa is evidence-informed and results-driven, with focus on restoring function, returning patients to activity, and improving quality of life. See what patients have to say about Dr. Melissa by clicking here.
Her clinical focus includes musculoskeletal pain, immune and endocrine disorders, gastrointestinal and cardiometabolic health, neurological conditions such as migraine, sports performance, detoxification, and healthy aging/longevity medicine including menopausal hormone therapy (MHT).
In addition to conventional and integrative testing and treatment, Dr. Melissa offers a wide range of restorative therapies, some of which include:
Trigger point injections
Ultrasound-guided regenerative injections such as prolotherapy and platelet-rich plasma (PRP)
Traction therapy
Craniosacral therapy
Visceral manipulation
Soft tissue mobilization
Yoga therapy
Red light therapy
IV therapy
Fluent in both English and Spanish, Dr. Melissa has worked in healthcare since 2004 across a broad spectrum of roles: Care Provider for children with special needs and older adults, Spanish Medical Interpreter, Clinic Coordinator, Peace Corps Health Volunteer in Perú, Nutritionist, Yoga Therapist, Naturopathic Doctor, and Health Researcher.
Her research contributions span nearly two decades across basic science, epidemiology, and practice-based research at institutions including the National Institutes of Health (NIH), Oregon Health & Science University (OHSU), the Veterans Affairs Medical Center, Integrative Medicine Institute (IMI), Helfgott Research Institute, RestorePDX, LettuceEat, and the Biome Project. She has advanced standards for reporting on and publishing from the point-of-care through work on the CARE guidelines and by providing training for clinicians.
Dr. Melissa's mission is to provide high-quality, patient-centered care and to explore innovative treatments that truly make a difference—especially in addressing the chronic pain epidemic. Her clinical work is informed by a deep curiosity and dedication to evidence-informed regenerative therapies.
She earned her Doctorate in Naturopathic Medicine (ND, 2021) and Master of Science in Integrative Medicine Research (MSc, 2016) at the National University of Natural Medicine (NUNM), a leading institution in natural medicine and health research. She completed a CNME-approved residency at Seattle Nature Cure Clinic under the mentorship of Dr. Masahiro Takakura, ND, DC, LAc, PhD, with a focus on musculoskeletal pain, sports medicine, and primary care.
A lifelong learner and teacher, she is also an Experienced Registered Yoga Teacher (E-RYT 500) with over 2,000 hours of teaching experience, trained at the Kripalu Center for Yoga & Health (Massachusetts) and Rishikesh YogPeeth (India). She is a Nutritional Therapy Practitioner (NTP) and earned dual undergraduate degrees through the Honors Program at the University of Portland—a Bachelor of Science in Biology and a Bachelor of Arts in Spanish with a Minor in Chemistry—including studies at Universidad de Granada in Spain.
Outside the clinic, Dr. Melissa is a proud mother and partner to a Complementary and Integrative Health (CIH) Research Investigator. She finds joy in nature—hiking, biking, swimming, running, paddleboarding, practicing yoga, and learning new sports like surfing and kiteboarding. She loves to travel and cherishes time spent in community.
Dr. Barber’s Hours—
Tues, Wednesday, Thurs 9:30-4:30
For Dr. Barber’s Rates Please Click Here
Dr. Barber is pictured
Dr. Liberty Hunter
Naturopathic Doctor
Dr. Liberty Hunter earned her Doctorate in Naturopathic Medicine from Bastyr University California in San Diego in 2024. She is currently completing her residency at Wild Oak Medicine under the mentorship of Dr. Holder and Dr. Riegle and is about to begin her second year. Her clinical focus includes environmental medicine, oncology support, neurological conditions, and complex chronic illness.
During medical school, Dr. Liberty completed a preceptorship with Dr. Holder and Dr. Riegle, an experience that helped shape her interest in treating complex cases and deepened her commitment to environmental medicine, detoxification, and the impact of toxic exposures on long-term health. As part of her work at Wild Oak Medicine, she has also developed a strong interest in research related to toxicology, including participation in firefighter detoxification study programs.
Dr. Liberty’s passion for both nature and healthcare began early in life. As a child, she could often be found in the horse pastures, studying flowers and plants and applying what she learned from veterinary books to her horses, gently massaging buds and stems into their hair in hopes of improving their health and well-being. That curiosity eventually evolved into a deeper interest in the relationship between nature and healing.
While studying at UC Davis, a medical volunteer trip to Central America became a turning point. There she recognized the importance of a holistic approach to medicine that considers lifestyle, diet, emotional well-being, and community as essential parts of care. This experience ultimately led her to pursue naturopathic medicine.
Dr. Liberty remains passionate about therapies that support the body’s innate healing processes. She has pursued additional training in IV therapy, biofeedback, craniosacral therapy, and reiki, and continues to integrate hands-on and energetic modalities alongside her other use of lifestyle changes, botanical medicine, supplementation, and hydrotherapy in her clinical work.
She now lives along the Russian River with her partner, Dio, and their maltipoo, Tansy. Outside of the clinic, she enjoys live music, spending time outdoors, and exploring the rivers and landscapes of Northern California. Dr. Liberty is grateful to continue learning within the Wild Oak Medicine community and is honored to support patients on their healing journeys.
Dr. Hunter’s Hours—
Monday-Thursday 9-5 and Friday 9-4
For Dr. Hunter’s Rates Please Click Here
Jessica Woodruff
Lead Naturopathic Medical Assistant
Jessica is an integral part of our team at Wild Oak Medicine. She graduated from Medical Assistant school in 1999 and has spent her career in a wide diversity of roles, including surgical assistant, apheresis technician, and phlebotomist.
Jessica is married with two children, and enjoys spending time outside with her family.
Nikki Nystrom
Naturopathic Medical Receptionist
Nikki is a dedicated healthcare professional with a passion for supporting the health and well-being of her community. Recently certified as a Patient Care Representative, Nikki brings compassion, reliability, and a personal touch to every interaction. She believes in making healthcare more accessible, supportive, and human-centered. Nikki is proudly married to her best friend.
Sara Umbro
Research Assistant and Patient Care Specialist
Sara is a research assistant and patient care specialist at Wild Oak Medicine, where she brings a passion for integrative, holistic approaches to well-being. She has a background in neuropsychology and experience in research roles across clinical settings. She holds a B.A. in Psychology and is currently pursuing her M.A. in Clinical Mental Health Counseling: Expressive Arts Therapy. In her free time, she enjoys expanding her creative practices and exploring nearby creeks and rivers.
