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 women's health, infertility, biofeedback, and traditional medicine practices.

Dr. Jen 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. Jen 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 also works closely with the wonderful team at Flourish Integrative Health and will resume seeing patients with Flourish in the coming years.

Dr. Riegle’s Locations—
432 Aviation Blvd, Santa Rosa, CA 95403

Monday, Wednesday from 9:30-3:30

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 the new naturopathic doctor resident at Wild Oak Medicine. During her time at the internationally-acclaimed naturopathy program at Bastyr University, she actively pursued hours precepting with advanced oncologists, toxicologists, homeopaths, and herbalists. During her 4th year, she 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 also spent time advance preceptoring under Dr. Holder and Dr. Riegle, two environmental medicine specialists who opened her eyes to how toxicity plays a role as a major leading factor in how disease can manifest and how important it is to detox regularly.

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.Dr. Millard’s Location—
432 Aviation Blvd, Santa Rosa, CA 95403

M-Th 10-5 and Friday 10-4

Jessica Woodruff

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

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