Providers

Chad Aschtgen, ND, FABNO

Dr. Chad Aschtgen is a board-certified naturopathic oncologist (FABNO) and the founder of Seattle Integrative Oncology, caring for patients in Seattle, Everett, and Olympia.

Since earning his Doctorate of Naturopathic Medicine from Bastyr University, Dr. Aschtgen has helped thousands of people facing cancer. He opened Seattle Integrative Oncology in 2008 and built it into the region’s premier naturopathic oncology clinic — now Providence’s exclusive regional partner in naturopathic oncology, home to the only hospital-based integrative cancer treatment program and the only naturopathic oncology residency in Washington State.

Dr. Aschtgen was a co-investigator on a National Institutes of Health (NIH)-sponsored study of integrative oncology outcomes in breast cancer patients. Appointed by Governor Jay Inslee, he serves as chair of the Washington State Department of Health Board of Naturopathy, and has served on the Board of Examiners for the American Board of Naturopathic Oncology. A frequent lecturer, he has spoken for the American Cancer Society, Swedish Cancer Institute, Fred Hutchinson Cancer Research Center, the Providence Regional Cancer Partnership, and more.

Dr. Aschtgen works closely with patients and their oncologists — using nutrition, vitamins, herbal and mineral therapies to build custom plans that support treatment, manage symptoms, and help patients reach their best health. Whether newly diagnosed, in active treatment, or in long-term survivorship, patients have a trusted resource in Dr. Aschtgen.

Erica Joseph, ND, LAc, FABNO

Dr. Erica Joseph is a board-certified naturopathic oncologist (FABNO) and licensed acupuncturist at Seattle Integrative Oncology, helping lead integrative cancer care at the Providence Regional Cancer Partnership in Everett.

Dr. Joseph completed the first cohort of SIO’s two-year oncology-based naturopathic residency and holds a doctorate in naturopathic medicine, a master’s in acupuncture, and a bachelor’s in psychology and biology from Bastyr University. She sees patients in both private practice and a hospital-based setting, and is passionate about training the next generation of naturopathic oncologists.

Dr. Joseph served as president of the Oncology Association of Naturopathic Physicians (OncANP) from 2021 to 2024, sat on the OncANP conference content committee for seven years, represented OncANP in the AANP House of Delegates, and served on the American Board of Naturopathic Oncology (ABNO). She is a peer reviewer for the Journal of Integrative and Complementary Medicine and a contributor to the Natural Medicine Journal.

Highly sought after across the Puget Sound region, Dr. Joseph has presented for Cancer Lifeline, Swedish Cancer Institute, Kaiser, the University of Washington Medical Center, the Puget Sound Oncology Nursing Society, Providence Hospital grand rounds, and the WANP annual conference.

Jenna Bailey, ND, FABNO

Dr. Jenna Bailey is a board-certified naturopathic oncologist (FABNO) at Seattle Integrative Oncology, with a special focus on blood (hematological) cancers.

Dr. Bailey earned a bachelor’s in Clinical Laboratory Science from the University of North Carolina at Chapel Hill and her Doctorate of Naturopathic Medicine from Bastyr University, and is a graduate of SIO’s two-year naturopathic oncology residency. She regularly gives talks on naturopathic and natural health through the Providence Regional Cancer Partnership’s Survivorship Series in Everett and nutrition presentations at Providence Integrative Cancer Care in Lacey/Olympia.

Combining a strong laboratory-science background with whole-person care, Dr. Bailey starts every patient with foundational support — sleep, nutrition, key nutrients, and hydration — while building a therapeutic relationship that treats the whole person, not just the disease.

Jessica Harrigan, ND, LAc, FABNO

Dr. Jessica Harrigan is a board-certified naturopathic oncologist (FABNO), licensed acupuncturist, and Chinese herbal medicine practitioner at Seattle Integrative Oncology.

Dr. Harrigan joined SIO in 2021 and completed her two-year naturopathic oncology residency in 2023, earning her FABNO designation in 2025. She holds a bachelor’s in biology (genetics and developmental biology) from Arizona State University and a doctorate in naturopathic medicine plus a master’s in acupuncture and Oriental medicine from Bastyr University. She offers acupuncture and Chinese herbal medicine as part of her patients’ integrative cancer care, and — drawing on her background in the fitness community — is passionate about incorporating movement into her patients’ lives.

Brooke Waldersen, ND

Dr. Brooke Waldersen is a naturopathic doctor at Seattle Integrative Oncology focused on nutrition, lifestyle medicine, and foundational health in integrative cancer care.

Dr. Waldersen joined SIO in 2023 after a one-year general naturopathic residency at the Bastyr Center for Natural Health, then completed the clinic’s two-year naturopathic oncology residency. She holds a bachelor’s in biochemistry and business from Baylor University and a Doctorate of Naturopathic Medicine from Sonoran University of Health Sciences. She works closely with patients and oncology teams to integrate evidence-informed natural therapies and nutrition strategies that support treatment outcomes, reduce side effects, and aid recovery and survivorship.

Dr. Waldersen is the attending physician for the Bastyr-affiliated oncology shift at SIO and is adjunct faculty at Bastyr University, where she helps train naturopathic medical students. She also leads monthly community nutrition classes on the role of food and lifestyle in cancer prevention and healing.

Ashley Baker, ND

Dr. Ashley Baker is a naturopathic physician in residency at Seattle Integrative Oncology, with a focus on therapeutic nutrition, culturally responsive care, and health equity.

Dr. Baker earned her Doctorate of Naturopathic Medicine from Bastyr University in 2024 and holds a bachelor’s in food and nutrition sciences (dietetics) from Seattle Pacific University. A strong advocate for health equity, her interests include therapeutic nutrition and advancing care for Indigenous and LGBTQ+ communities. Outside the clinic, she enjoys gardening, traveling, and time outdoors with her chocolate lab, Bodhi.

Gabriela Emond

As our Seattle based Office Coordinator, Gabriela has performed scheduling, record collection, and billing services for Seattle Integrative Oncology since March 2018. With an additional nine years’ previous experience offering administrative support in various healthcare settings, Gabriela enjoys following our patients from registration to long-term care. She is available to help make this process as easy as possible for new and returning patients and does so with a compassionate, thoughtful mindset.

 

Gabriela also provides oncology massage services to our patients, having completed advanced training in cancer-focused massage at the East West College of Healing Arts in 2023. This highly specialized coursework prepared her to work safely and effectively with clients at any stage of cancer care to include active treatment, recovery, and survivorship.  Gabriela works with each patient to design an effective treatment plan that uses a gentle, nurturing touch to help ease physical tension, reduce anxiety, and support the body’s natural healing processes.  

Chris Lower

Chris brings over ten years’ experience in management and small business operations to Seattle Integrative Oncology. Chris also has a tremendous passion for helping patients navigate the complexities of cancer care and treatment and demonstrated this daily during his time as the former Coordinator for Providence Regional Cancer System’s Integrative Medicine Program in Olympia. As SIO’s Clinic Operations Manager, Chris works with both our doctors and front desk staff to increase the efficiency of the practice while also strategizing ways to improve patient satisfaction. A 2014 graduate of the University of Washington, Chris is currently working on completing a Master of Science and doctorate through Portland State University’s Earth, Environment, and Society Program.

Lyneshia Weldon

With a diverse background in healthcare, Lyneshia brings valuable experience as a Patient Service Representative, Medical Assistant, Health Unit Coordinator, and Pharmacy Technician. She earned her degree in Healthcare Administration from Ross Medical Education Center and is currently continuing her studies at the University of Washington. Lyneshia was drawn to cancer care through her own family’s journey, which inspires her dedication to supporting patients and their loved ones with compassion. She is committed to fostering a positive, patient-centered experience at every stage of care.