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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. Using Medicare Part D data, she examined the relation between drug plan benefits and prescription drug use among older adults. She is currently analyzing Medicare Advantage (MA) Encounter data to evaluate care provision for MA enrollees. She uses econometric approaches to infer causal relations in her analysis of Medicare data.