Aleš Česen, born on April 26, 1982, is a Slovenian mountaineer, climber, and mountain guide, internationally renowned for his technical and challenging ascents. The son of renowned mountaineer Tomo Česen, he grew up in a family marked by a passion for the mountains and began climbing as a child, encouraged by his father and brother.

In 2023, he made mountaineering history by making, with Tom Livingstone, the first ascent of the west ridge of Gasherbrum 3 (7,952 m), without supplemental oxygen or fixed ropes, embodying an approach to mountaineering based on self-reliance and freedom. This expedition, carried out in extreme conditions, illustrates his search for the pure essence of very high-altitude mountaineering.

Aside from his sporting achievements, Aleš Česen is the father of two sons and shares his passion for the mountains through his work as a guide and instructor. He is considered one of the most accomplished mountaineers of his generation, continuing a family tradition of excellence in the mountains.