Lieutenant Colonel Wickliffe "Wick" Walker (United States Army, retired) is a graduate of Dartmouth College, the John F. Kennedy School for Special Warfare, and the Banff Centre for Arts and Creativity. He represented the United States in international whitewater canoe competition at the World Championships of 1965, 1967, and 1971, and at the 1972 Summer Olympics at Munich. A National Geographic Explorer and Fellow of the Explorers Club, he has led whitewater expeditions around the world, including to Bhutan in 1981 and to Tibet in 1998. His current narrative nonfiction project is Torrents As Yet Unknown: Daring Whitewater Ventures into the World's Great River Gorges.