George Visger, a member of the San Francisco 49ers' first Super Bowl champions in 1981-82, has lived with a shunt in his brain ever since as a result of the many concussions he sustained during his football career. Despite suffering from "water on the brain" and impaired short-term memory, he became a wildlife biologist, a prominent figure in the fight for fair treatment of retired players by the $10-billion-a-year National Football League, and advocate in solutions to the American football concussion crisis at all levels. This is his remarkable story.