Melissa A. Walker, MD, PhD is a fourth year trainee in the Massachusetts General Hospital Child NeurologyMedical specialty focusing on disorders of the nervous system. Residency Program. Dr. Walker’s clinical and scientific interests focus on improving the understanding and treatment of primary mitochondrialRelated to the mitochondria. disorders. Dr. Walker received her MD and PhD degrees from Columbia University College of Physicians and Surgeons in New York City, New York. She trained in Pediatrics at the Massachusetts General Hospital for Children in Boston, Massachusetts.