Dean Karnazes

Dean Karnazes is an ultramarathon runner and bestselling author named by TIME magazine as one of the 100 Most Influential People in the World. He has completed 50 marathons in all 50 US states in 50 consecutive days, run across Death Valley in summer, run a marathon to the South Pole, and won the Badwater Ultramarathon and World's Toughest Footrace. An ESPN ESPY winner and three-time Endurance Athlete of the Year, he has raced on all seven continents twice and served as a US Athlete Ambassador.