Extreme skiing is performed on long, steep (typically from 45 to 60+ degrees, or grades of 100 to 170 percent) slopes in mountainous terrain. The French coined the term 'Le Ski Extreme' in the 1970s. The first practitioners include Swiss skier Sylvain Saudan, who invented the "windshield wiper" turn in the mid-1960s, and in 1967 made the first descents of slopes in the Swiss, French and Italian Alps that were previously considered impossible. Saudan's 'first descent' in America was at Mt. Hood March 3, 1971. Early American practitioners include Bill Briggs, who descended Grand Teton on June 16, 1971. The Frenchmen Patrick Vallençant, Jean-Marc Boivin and Anselme Baud and the Italians Stefano De Benedetti and Toni Valeruz were among those who further developed the art and brought notoriety to the sport in the 1970s and 1980s.
The key North American skiers who popularized the sport include: Doug Coombs, Shane McConkey, Seth Morrison, Glen Plake, David Kraft and Scot Schmidt, all known as "The extreme-6" and were considered among the top 6 extreme skiers in the world during their prime.
Because of the extremely long, steep slopes, and dangerous terrain, single mistakes at the wrong moment by some extreme skiers have led to them being seriously injured or killed.
- Luigi Castellarin (31 May 1996). "Toni Valeruz in smoking per una discesa <<di gala>>". Press=La Stampa.
- Paul Dreyfus (1970). "Sylvain Saudan: Skieur de L'Impossible". Book. Arthaud.
- www.wildsnow.com, Tanner Hall who broke his ankles hitting Chads Gap, Bill Briggs biography.
- Bruce, Rob. "McConkey". IMDB.com. MSP Films/Red Bull Media House (2013). Retrieved 3 April 2015.