Dr. Walter helped create The Sports Concussion Program with the collaboration of Children’s Hospital of Wisconsin, Medical College of Wisconsin, and Froedtert Hospital. He is a member of the Wisconsin Interscholastic Athletic Association, vice chair of the Wisconsin chapter of the American Academy of Pediatrics council on sports medicine and fitness, a co-chair of the National Council on Youth Sports Safety, and a member of the Institute of Medicine Committee on Sport-Related Concussion in Youth.