He is considered one of the greatest filmmakers of sport adventure film. He has made more than 80films and collaborated in numerous films by other directors. In 1970 he began his climbing career on the North wall of the Eiger, taking his camera to make his first film on mountaineering. Over the years he has made many other films, on Mount Cervino, in Patagonia, on Mount Everest (where he shot Reinhold Messner and Peter Habeler’s ascent without the aid of oxygen). In his film “Dudh - Kosi - The Relentless river of Everest” he documented the unpredictable flow of the highest river in the world winning the Great Prize in Trento in 1978. He was Chairman of the International Jury panel at the 40th Film Festival, in 1992, and again a member of it in 2003.