Dr. Ong received a B.S. in Biological Sciences from the University of California, Irvine; his medical degree from the University of California, San Diego; and a Ph.D. in Health Services and Policy Analysis from the University of California, Berkeley. He completed the Primary Care Internal Medicine residency at the University of California, San Francisco, and a VA Ambulatory Care Fellowship with the Center for Primary Care and Outcomes Research at Stanford University, prior to joining the faculty at the University of California, Los Angeles.