Stefan has climbed his most difficult routes in his local Alps. In 2000, he opened the »La vida es silbar« route (7c) and in 2001, he successfully completed the first ascent of »The Young Spider« (EX+, 7a, A2, WI6/M7) with Ueli Steck. He proved his all-round abilities, likewise with Steck, when they climbed the north walls of the Eiger, the Mönch and the Jungfrau in just 25 hours in 2004 and also notched up the fastest rope ascent of the north face of the Eiger. With a time of nine hours, they took one hour off the thirty-year-old record set by Messner and Habeler. The current highlight was achieved by the Dreamteam in 2008 with the first ascent of »Pacienca« (8a), the most difficult sport climbing route on the north face of the Eiger.