Dean Karnazes is an American ultramarathon runner and best-selling author. By an early age, Dean had already hiked across the Grand Canyon and climbed Mount Whitney. Some of his notable achievements include running 350 miles without sleep, running numerous marathons across the world and winning many tortuous long-distance races. Dean has also been featured on many popular television shows, such as The Late Show with David Letterman and is a popular author with his books detailing his career.

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