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Spyros Chalkias holds the position of Senior Medical Director for Clinical Development in Infectious Disease - Public Health Vaccines at Moderna. Previously, Spyros Chalkias served as Senior Medical Director, Medical Director, and Associate Medical Director at Biogen. In addition, Spyros Chalkias worked as a Clinician and Investigator in Infectious Diseases at Harvard Medical School-Beth Israel Deaconess Medical Center.