David Chou, MD, PhD is a physician-scientist who leads the Bone Marrow Chip team at the Wyss Institute at Harvard University as a Principal Scientist. He also serves as the Principal Investigator of the AVATAR project at Emulate, Inc. His work focuses on developing novel drugs to mitigate radiation-induced tissue injury and understanding the effects of spaceflight (including space radiation) on the hematopoietic system.