Mark Twight

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. Provided by Wikipedia