Dean Potter: The Man Who Can Fly

The first free solo climb of the south wall of El Capitan, in Yosemite National Park, Calif., was by climber Dean Potter. Potter, 39, also slacklines and BASE jumps. He is profiled on 'The Man Who Can Fly,' premiering Sunday, February 12, at 8 PM ET/PT on National Geographic Channel. (Mikey Schaefer)