Dr. Mack Mackiewicz is a Program Director in the Neurobiology of Aging and Neurodegeneration Branch in the Division of Neuroscience. Dr. Mackiewicz received his M.S. in microbiology and genetics from Warsaw University, Poland, and his Ph.D. in genetics from the National Cancer Institute in Warsaw, Poland. Prior to joining NIA in 2009, Dr. Mackiewicz was a faculty member in the Department of Medicine, University of Pennsylvania School of Medicine in Philadelphia, where he conducted research on the cellular and molecular mechanisms regulating sleep and the circadian clock. At NIA, Dr. Mackiewicz is responsible for research on integrative neurobiology, sleep and biorhythms.