Dr. Ou is a licensed Internal Medicine in CA. Graduated in 2009. Medical degree obtained from Keck School of Medicine of USC. Completed residency training at Loma Linda University. Currently practices at Jonathan Ou MD (Jonathan Ou MD), located at 2707 S. Diamond Bar Blvd, Diamond Bar, CA 91765. Dr. Ou specializes in internal medicine and primary care.. In addition to English, Dr. Ou speaks Mandarin and Cantonese.