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 carries 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 connecting with each of her patients. She combines her knowledge and skills as a diagnostician in the western and traditional medicine worlds, with a deep compassion and intuition, to provide a comprehensive treatment plan for physical, mental, emotional, and spiritual healing for her patients.
Dr. Riegle works with her patients, moving toward this balance using physical medicine, biofeedback and meditation, hydrotherapy, supplemental and herbal medicine, spiritual practices, and conventional approaches such as labs, medications, and various conventional tests.
When not with patients, you'll likely find Jen spending time with her friends and family, dancing, playing outside, in ceremony, cooking, traveling, and spending time on retreat with her spiritual mentors. Dr. Riegle also is the co-founder and medical director for a non-profit, Integrative Healers Action Network, which functions to bring integrative medicine practitioners into communities impacted by disaster to volunteer. Dr. Riegle is the program director for Wild Oak Medicine’s cutting edge first responder treatment programs.
Dr. Riegle’s Locations—
432 Aviation Blvd, Santa Rosa, CA 95403
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. He has put together the Bay Area Breast Health Collective to aid patients and practitioners in making the lifestyle changes needed to prevent breast cancer.
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 was recently named President of the California Naturopathic Doctors Association Board. Sonoma Magazine has named Dr. Holder as one of Sonoma County Top Doctors 2016.
Dr. Holder’s Location and Hours—
432 Aviation Blvd, Santa Rosa, CA 95403
Hours: M, Tu, Th from 10-5.
Dr. Ellen Millard
Naturopathic Doctor
Dr. Ellen Ines Millard is a naturopathic doctor who is passionate about optimizing individual health through detoxification and lifestyle changes. During her time at the internationally-acclaimed naturopathy program at Bastyr University, she actively pursued hours precepting with advanced oncologists, toxicologists, homeopaths, and herbalists. She has also completed a 9 month internship at a water fasting clinic, True North Health Center, in northern California where she witnessed chronic disease reversal in only a few weeks of healthy food, water, and juices.
She has a passion for working with athletes, young women, and families. She utilizes a variety of modalities from diet and nutrient therapies, botanical medicine, nervous system regulation techniques, IV therapies, and supplementation.
In order to best diagnose and help treat her patients, she often utilizes state of the art functional lab testing to best identify the root cause of any manifesting diseases.
More about Dr. Millard:
During her graduate time in Boston, she better understood how poor nutrition and lifestyle choices directly leads to the manifestation of chronic diseases, such as heart disease and diabetes. Over 50% of Americans have a chronic disease and almost all of these illnesses are preventable if the education is available and the lifestyle choices are followed. As a result, Ellen became president of a Food Injustice group that grew and donated thousands of pounds of crops each year to food deserts around Boston. She also put on cooking demonstrations and garden tutorials to maximize healthy food access to all. Knowing she wanted to advocate for food justice as some type of physician, she was determined to become a naturopathic doctor after she studied abroad in Ecuador and spent 3 months learning from an herbal indigenous healer. She completed her thesis on Conventional Western Medicine versus Alternative Plant Medicine, comparing the diagnostic, treatment, and recovery methods of both types of medical approaches. She quickly learned that she could blend the pros of both medicines to optimize healing for her future patients.
In her free time, you can find Ellen doing any type of outdoor activity from mountain biking, skiing, horseback riding, paddle boarding, etc. She values her time with her family and community organizing events around ceremony, food justice, and healthy living. She is currently on maternity leave, waiting for her baby boy to be introduced into the world.
Dr. Millard’s Location—
432 Aviation Blvd, Santa Rosa, CA 95403
Returning Mondays and Fridays starting December 2024.
***Dr. Millard will be on maternity leave from end of August until December 2024***
Dr. Melissa Barber
Naturopathic Doctor
Dr. Melissa’s focus is whole-person pain management, offering manual therapies including trigger point needling, ultrasound-guided injections, traction, shockwave, soft tissue mobilization, craniosacral, visceral manipulation, and yoga therapy. In treating the whole person, she also addresses other systems to support the musculoskeletal system, including but not limited to gastrointestinal, endocrine, and immune health. She loves to use botanical medicine!
Dr. Melissa S. Barber, ND, MSc, E-RYT, NTP is bilingual in English and Spanish and has been working in healthcare since 2004 – providing care to children with special needs and older adults, working as a Spanish Medical Interpreter, Clinic Coordinator, a Community Health Peace Corps Volunteer in Perú, Nutritionist, Yoga Teacher and Yoga Therapist, and as a Naturopathic Doctor. She has been steeped in health research at hubs including the National Institutes of Health (NIH), Oregon Health and Science University (OHSU), the Veterans Affairs (VA) Medical Center, the Integrative Medicine Institute (IMI), Helfgott Research Institute, LettuceEat, RestorePDX, and the Biome Project, among others – working from bench to bedside, focused on improving patient health outcomes and the patient experience. Her mission is to provide the best patient-centered care, empower patients to meet their health goals, and offer therapies that actually work. She is motivated to address the chronic pain epidemic and investigate promising therapies – including regenerative medicine. Dr. Melissa supports an informed decision-making process where she provides the evidence and advocates for patient preference. She sincerely cares for her patients and appreciates receiving feedback about their care experience.
Dr. Melissa received her doctoral degree 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 and completed a CNME-approved residency at Seattle Nature Cure Clinic in Seattle, Washington under the mentorship of Dr. Masahiro Takakura, ND, DC, LAc, PhD, specializing in pain management, sports medicine, and primary care. She is an Experienced Registered Yoga Teacher with over 2,000 hours of teaching experience (E-RYT 500) trained at the Kripalu Center for Yoga and Health in Stockbridge, Massachusetts and Rishikesh YogPeeth in Rishikesh, India. She has a Nutritional Therapy Practitioner (NTP) certification from the Nutritional Therapy Association (NTA). Dr. Melissa received her Bachelor of Science (BS) in Biology, Bachelor of Arts (BA) in Spanish, and Minor in Chemistry in the Honors Program at the University of Portland in Portland, Oregon and Universidad de Granada/University of Granada in Granada, Spain.
Dr. Melissa is a mom to a beautiful son and partner to a complementary and integrative health (CIH) research investigator. Dr. Melissa loves the outdoors – she hikes, bikes, runs, swims, paddle boards/SUP, practices yoga, tries to surf and kiteboard, and loves to travel and be with community.
Dr. Barber’s Location—
432 Aviation Blvd, Santa Rosa, CA 95403
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 Location—
432 Aviation Blvd, Santa Rosa, CA 95403
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.
Jessica’s Location—
432 Aviation Blvd, Santa Rosa, CA 95403
M-Th 9-5, Friday 9-4
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.
Erin’s Location—
432 Aviation Blvd, Santa Rosa, CA 95403
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.
Sarah’s Location—
432 Aviation Blvd, Santa Rosa, CA 95403
