Paul Kiesow Petzoldt (January 16, 1908 - October 6, 1999) was one of America's most accomplished mountaineers. He is perhaps best known for establishing the National Outdoor Leadership School in 1965. He made his first ascent of the Grand Teton in 1924 at the age of 16, becoming the youngest person at the time to have done so. In 1938 he was a member of the first American team to attempt a climb on K2. For the climb he did not use assisted oxygen; he learned to use rhythmic breathing. He and Dan Bryant, from New Zealand, were the first climbers ever to traverse the Matterhorn twice in one day.