Dr. Earhart is a physical therapist and movement scientist whose work focuses on gait and balance issues faced by people living with Parkinson's disease and the impacts of exercise and physical activity on these issues. She completed her physical therapy training at Arcadia University, her PhD at Washington University in St. Louis, and a postdoctoral fellowship at Oregon Health & Science University. Gammon is currently Professor of Physical Therapy, Neuroscience & Neurology, as well as Associate Dean and Director for Physical Therapy, at Washington University in St. Louis.