Mark Twight (born November 2, 1961) is an American climber, writer and the founder of Gym Jones. He rose to prominence as a mountaineer in the late 1980s and early 1990s with a series of difficult, dangerous alpine climbs in various ranges around the world. His radical, light-weight approach to alpinism has seen him regarded as an influential figure in the single-push movement. Climbing In 1988, Twight made the first ascent of "The Reality Bath" on the White Pyramid with Randy Rackliff, which remains unrepeated. The route has been described by Canadian Rockies guidebook author, Albi Sole as "so dangerous as to be of little value except to those suicidally inclined." In his own guidebook to the Rockies, Joe Josephson declared that "The Reality Bath is undoubtedly the most dangerous ice route in the range." That same season Twight established a speed record on the 925 meter-high "Slipstream" (2hrs 4min) on the east face of Snowdome. Twight's first ascents in the Mont Blanc massif near Chamonix, France, include "Richard Cranium Memorial" on the northwest face of Les Droites with Barry Blanchard (1990), "Beyond Good And Evil" on the north face of the Aiguille des Pelerins with Andy Parkin (1992), and "There Goes The Neighborhood" on the northwest face of the Aiguille Sans Nom with Scott Backes (1993). In the Himalayas, Twight attempted more routes than he succeeded on, being turned away by the South Pillar of Nuptse with Jeff Lowe (twice), and shut down below the summit of Nanga Parbat when a storm forced retreat down the Rupal Face (accompanied by Barry Blanchard, Kevin Doyle and Ward Robinson). Other notable Himalayan climbs include the first ascent of the northwest face of Kangtega with Alison Hargreaves, Tom Frost and Jeff Lowe. Twight made several notable ascents in the Alaska Range. In 1994, he and Scott Backes climbed "Deprivation" on Mount Hunter in 72 hours roundtrip, which halved the previous fastest ascent of the North Buttress. The 39 hours non-stop ascent is considered a landmark moment in the single-push climbing movement. Twight's participation in this style of climbing culminated with the 60-hour ascent of the Slovak Direct on the south face of Denali in June 2000 with Backes and Steve House. During his visits to the Alaska Range, Twight participated in a variety of high-profile rescues. Twight was nominated for the Piolet d'Or twice during his career, in 1993 for "Beyond Good