Jeah Jung, Ph.D., M.P.H., is a Professor in the Department of Health Administration and Policy in the College of Health and Human Services at George Mason University. She has 20 years of experience with Medicare data. Using varied Medicare data sets, she has authored numerous papers that examined health service use or spending, quality of care, and health outcomes among Medicare beneficiaries. Analyzing Medicare Fee-for-Service claims data, Dr. Jung examined how provider practice patterns change in response to new Medicare policies or market environments.