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Dr. Ron Ostrom, DO, Medical Director

Dr. Ronald Ostrom is an Emergency Medicine physician in the County of Kern. He is affiliated with multiple hospitals in the area, including Bakersfield Heart Hospital, Mercy Hospitals of Bakersfield, as well as the Medical Director for Hall Ambulance. Dr. Ostrom received his medical degree from the College of Osteopathic Medicine of the Pacific and has been in practice for 20 years. He is one of 7 providers, as well as the Medical Director of the West Side Family health Care Facility. Dr. Ostrom resides in Bakersfield with his wife and 2 children.


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Heather Bosma, Pediatric Nurse Practitioner

Heather Bosma obtained a bachelor of science in nursing from Fresno State in 2005. She worked as a pediatric nurse for several years at Valley Children’s Hospital in Madera and Cottage Children’s Hospital in Santa Barbara. After receiving her master of science in nursing and school nurse credential from California State University Bakersfield in 2010, she worked as the school nurse for Taft City Schools and Taft High School. She received her Family Nurse Practitioner certificate from Western University of Health Sciences in 2013. Heather is dedicated to providing comprehensive health care and promoting healthy choices for individuals and the community.


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Elizabeth White, MSN, RN, FNP-C

Beth is a Family Nurse Practitioner and Board Certified by the American Association of Nurse Practitioners. Born and raised in Bakersfield, CA;. she began her nursing career in 2011, working as a Registered Nurse in the Intensive Care Unit. Beth holds both a Bachelor’s Degree and Master’s Degree in Nursing from California State University, Bakersfield.

Beth is dedicated to serving the residents of West Kern County. She is qualified to diagnose and treat a wide array of conditions across the entire lifespan and believes in working collaboratively with each individual to achieve their best possible state of health.


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Abundio Castillo, MSN, RN, PHN, FNP-C

Abundio Castillo was born in Mexico and moved to the United States in 1993. In Mexico, he studied Business administration, but always wanted to work in the medical field. During his career as RN he held many positions from staff nurse to director and manager of the emergency room at dignity hospitals in Bakersfield. Abundio moved to Bakersfield about 13 years ago, and has been working to serve the Kern County community and he found out that a lot of people lack the medical care attention, therefore, to better serve our community, he went back to school to become a Family Nurse Practitioner. He graduated in 2018 from Charles R. Drew University School of Medicine and Science. Since then, and has been working at Memorial Hospital ER, Priority Urgent Care and currently at West side Family Health Care Clinic in Taft. Abundio is bilingual in Spanish and English. He feels much rewarded to be able to help our Kern county community. Abundio is happily married and has 4 children. 


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 Dina Villanueva, D.O.

.Dr. Dina Villanueva is a family practice physician who has worked for West Side Health Care District since November 2018.  Dr. Villanueva has been a physician for almost 30 years, since she graduated from the Western University of Health Sciences in Pomona, CA.  She has worked most of her career in underserved areas, namely with the Alaskan Natives under the Indian Health Service (IHS) in Barrow & Wrangell, Alaska; the inmates in the California Department of Corrections & Rehabilitation (CDCR) in Central, CA; and numerous Federally Qualified Health Care (FQHC) facilities in Central & Southern, CA.  She is happy to now work in Taft, CA for the Federally Qualified Healthcare (FQHC) facility operated by West Side Health Care District because there is such a need for a primary care physician in such an underserved area.  She is open and willing to share what she knows about traditional and alternative medicine to all patients that can receive any benefit from her decades of experience.