Tommy Caldwell is the author of The Push and is an accomplished rock climber. He made the first ascents of some of the United States' hardest sport routes including Kryptonite (5.14c/d) and Flex Luthor (5.15a) at the Fortress of Solitude, Colorado. In January 2015, Caldwell and Kevin Jorgeson completed the first-ever free climb of the Dawn Wall of El Capitan in Yosemite National Park.
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