About the author: Alexander Huber is a German physicist, climber and mountaineer. Since 1992 Alexander Huber has been a state-certified mountain and skiing guide. He first studied physics, then became a full-time professional mountaineer in 1997 and is now one of the most successful climbers and mountaineers. While being an all-round climber, Alexander is most famous for his bold free ascents of big walls. He lives in Germany.