Melissa Wei, M.D., M.P.H., M.S., is a general internist and clinician investigator in the Division of General Medicine at the University of Michigan Medical School. Her research focuses on multimorbidity, the confluence of multiple medical conditions, including its measurement, risk factors and prognosis. She is particularly interested in identifying modifiable risk factors that may be translated into clinical and public health interventions to 1) optimize patient care, and 2) prevent or delay multimorbidity onset, progression and complications. As a general medicine fellow, she developed and validated the Multimorbidity Weighted Index (MWI). Her work has been recognized through the Mack Lipkin Associate Member Award and Milton Hamolsky Junior Faculty Award from the Society of General Internal Medicine. Dr. Wei also has longstanding clinical and research interests in nutrition and chronic disease prevention. She studied nutritional sciences as an undergraduate at Cornell University and previously held a position in the Department of Nutrition at the Harvard T.H. Chan School of Public Health. She has published on the associations between vitamin D and colorectal cancer, adenoma, and other health outcomes using meta-analyses, as well as other nutrient-disease associations. Dr. Wei received her Medical Doctorate and Master of Public Health in Epidemiology and Biostatistics from Oregon Health & Science University School of Medicine in 2010. She completed internal medicine residency in the primary care track at Emory University School of Medicine in 2013. She completed the Harvard Medical School General Medicine and Primary Care Fellowship Program and received a Master of Science (S.M.) in Nutritional Epidemiology from the Harvard T.H. Chan School of Public Health in 2015.