About Ueli Steck
Ueli Steck was a Swiss rock climber and alpinist. He set speed records on the North Face trilogy in the Alps. His claim to have climbed Annapurna solo via its South Face is disputed. He won two Piolet d'Or awards, in 2009 and 2014. Steck died after a fall while trying to ascend the north face of Nuptse.
Biography source:
Wikipedia