Hong, Sung-Taek is a mountaineer, adventurer, explorer and author from South Korea. He is currently a National Geographic Explorer supported by a National Geographic explorers program and a principal of KSAF Mountaineers Academy. He is renowned for reaching all the Three Poles and crossing the Bering Strait and Greenland for the first time. He summitted Everest in 1995, skied to the South Pole in 1994 and walked to the North Pole in 2005. He also crossed Bering Strait by foot in 2012 (official).