Vien Doan, D.O.
After earning a Bachelor of Science degree from Morningside College and a Medical Degree from Des Moines University, Dr. Doan went on to complete his residency focused on primary care at San Bernadino County Medical Center. He has provided medical services in the city of Riverside since 1988.
Dr. Doan came to America as a young teenager after the fall of Saigon in 1975. Rescued by the U.S. Navy’s 7th fleet and brought to Camp Pendleton, he and his family started their new life with the help of a kind sponsor family living in Iowa.
The early experience of unconditional love shown by this family touched his heart helping to shape his lifelong mission: to return and provide the gift of healing to the poor living in remote villages in Vietnam
As a result, Dr. Doan founded the Good Samaritan Medical Dental Ministry in 2000 — now the largest medical mission traveling to Vietnam. His humanitarian organization brings much needed healthcare services and medical training to people in underserved areas. Dr. Doan also leads Riverside’s Sister City partnership with Can Tho, Vietnam helping to build bridges through diplomacy, education and service.
Dr. Doan and his wife Grace have been married 41 years and are proud parents of three children: Luke, Ashley and Courtney.
Tin Chu, M.D.
Dr. Chu is a highly trained compassionate family medicine physician committed to delivering high-quality, evidence-based medical care. He studied psychology as an undergraduate at University of California, Irvine and finished his medical school education at St. George's University. He completed his residency at Arrowhead Regional Medical Center in San Bernardino, where he gained invaluable experience working with at-risk and underserved populations. He is well-trained in both inpatient and outpatient management for chronic and acute disease processes.
Dr. Chu combines clinical excellence with a warm, patient-centered approach ensuring each individual feels heard, respected, and empowered in their healthcare journey. He is dedicated to staying at the forefront of modern medicine, providing thoughtful, personalized care that makes a meaningful difference in his patients’ lives. He excels in outpatient procedures and utilizing bedside point-of-care ultrasound to keep his patients from uncessary visits to the Emergency Department. He is also a specialist in obesity medicine.
Ashley Doan, PA-C
Ashley Doan is a highly skilled Physician Assistant committed to delivering patient-centered care to individuals and their families across all stages of life. She completed her undergraduate studies in 2015, earning a Bachelor of Science in Chemistry, and later obtained her Master of Physician Associate Degree from Keck Graduate Institute (KGI) in 2024, where she graduated at the top of her class and served as class president.
Ashley brings a strong foundation in clinical science and leadership to our practice, blending thoughtful, personalized care with a warm and empathic bedside manner. Her dedication to both service and excellence reflects her deep commitment to building strong lasting relationships with patients, empowering them to make informed decisions about their health.