Welcome to Cucamonga Pediatrics. This practice was founded in 2003 by Dr. Tiffany Quan and Dr. Viet Ta, who retired in 2023.

Dr. René Lee (Yeung), D.O., completed her undergraduate studies with a degree in biology at UC Berkeley and graduated from medical school at Western University in Pomona, CA. She completed her pediatric residency at nearby Loma Linda in 2012 and is board certified in pediatrics. Dr. Lee has been with Cucamonga Pediatrics since 2012.

Dr. Cynthia Olatunji, M.D., obtained her undergraduate degree in biology as well as her medical degree at UC Riverside. She went on to complete her residency training at Loma Linda Children’s Hospital in 2023. She is passionate about providing compassionate care to the underserved pediatric population in Inland Empire. She joined the practice in 2025.

The amazing medical staff