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’s Hours—
Tuesday/Thursday 9:45-3:15 and Wednesday from 9:45-5
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.
Dr. Holder’s Hours—
Monday, Tuesday, Thursday from 10-5.
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 specializes in treating musculoskeletal issues—such as back, neck, and knee pain—as well as immune, endocrine, and gastrointestinal disorders, neurological conditions like migraines and headaches, menopausal hormone therapy (MHT), weight management, and sports performance. Her approach is integrative and results-driven, with focus on restoring function, returning to activity, and improving quality of life.
She offers a wide range of therapeutic services, including:
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
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 background in research is equally expansive. For nearly 20 years, she has contributed to basic science, epidemiology, and practice-based research at institutions such as the National Institutes of Health (NIH), Oregon Health & Science University (OHSU), the Veterans Affairs (VA) Medical Center, the Integrative Medicine Institute (IMI), Helfgott Research Institute, LettuceEat, RestorePDX, and the Biome Project. She has improved the standard on publishing from the point-of-care on patient treatment with work on the CARE guidelines and offering trainings 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) in 2021 and her Master of Science in Integrative Medicine Research (MSc) in 2016 from the National University of Natural Medicine (NUNM) in Portland, Oregon. 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 educator, Dr. Melissa is also an Experienced Registered Yoga Teacher (E-RYT 500) with over 2,000 hours of teaching experience. She received her yoga training at the Kripalu Center for Yoga & Health in Massachusetts and Rishikesh YogPeeth in India. She holds a Nutritional Therapy Practitioner (NTP) certification from the Nutritional Therapy Association and earned her Bachelor of Science in Biology, Bachelor of Arts in Spanish, and a Minor in Chemistry through the Honors Program at the University of Portland and Universidad de Granada in Spain.
Outside the clinic, Dr. Melissa is a proud mother, and a partner to a Complementary and Integrative Health (CIH) Research Investigator. She finds joy in nature—whether she's hiking, biking, swimming, running, paddleboarding, practicing yoga, or learning new sports like surfing and kiteboarding. She loves to travel and cherishes time spent in community.
Dr. Barber’s Hours—
Wednesday, Thurs, and Fri 9:30-4
Dr. Liberty Hunter
Pre-licensed Naturopathic Doctor
Dr. Liberty Hunter earned her Doctorate in Naturopathic Medicine from Bastyr University California, located in San Diego, in 2024. Following her graduation, she joined the Wild Oak Medicine team, where she currently serves as a medical assistant while completing her final licensing exams. During her academic training, she gained valuable experience through a preceptorship with Dr. Holder and Dr. Riegle, deepening her interest and expertise in environmental medicine and its critical impact on health.
Dr. Liberty’s passion for both nature and healthcare was evident from a young age. As a child, she would often be found in the horse pastures, applying her knowledge of flowers and plants—deemed safe from veterinary books—to her horses by massaging buds and stems into their fur, hoping to improve their well-being. This early curiosity evolved into a lifelong commitment to health, though it wasn't until a medical volunteer trip to Central America during her undergraduate studies at UC Davis, that she discovered her true calling. It was here that she realized the importance of a holistic approach to medicine—one that considers a person's lifestyle, diet, emotional state, and community in their care. This realization led her to the field of naturopathic medicine, where she has found her professional home.
Dr. Liberty is dedicated to helping her patients uncover the root causes of their health concerns, while promoting self-nourishment, education, and a sense of community. She has pursued additional trainings in biofeedback, craniosacral therapy, and reiki, with a particular passion for utilizing herbal medicine and hydrotherapy as part of her practice.
Recently, Dr. Liberty relocated to Sonoma County with her partner, Dio, and maltipoo, Tansy. Outside of her professional life, she enjoys attending music events and exploring the natural beauty of the area, so you may find her at a local show or down by the river. Dr. Liberty is eager to continue learning from her colleagues at Wild Oak Medicine and looks forward to providing exceptional care to her patients.
Dr. Hunter’s Hours—
Monday, Thursday 9-6, Friday 9-12
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.
Erin Hallstrom
Naturopathic Medical Assistant
Erin is a Naturopathic Certified Medical Assistant who has called Sonoma County home for nearly 20 years. A graduate of Empire College, where she earned her Medical Assistant certification in 2003, Erin has gained extensive experience in diverse medical environments, including family medicine and busy clinics. She has also shared her expertise by teaching classes at Cal Regional.
Erin’s career has also included work as a massage therapist, before becoming a part of the team at Wild Oak Medicine. After taking time off to raise her four children, Erin returned to the medical field with renewed passion. In her free time, she enjoys camping, outdoor activities, and quality time with her family.
Sarah Noble-Spangaro
Operations Manager
Sarah, a native of Sonoma County, recently returned to the area after living in Brooklyn, NY. Before she came to Wild Oak Medicine, Sarah spent 6 years working in the tech industry. She is a graduate of UC Berkeley and is currently pursuing her master’s in healthcare administration. Sarah handles business operations at Wild Oak Medicine and has been with the team since October 2023. She resides in Santa Rosa with her fiancé Jordan and her chihuahua, Teddy. In her downtime, you can find Sarah hosting trivia at local venues or throwing pottery.
