Jim McCarthy’s name is deeply etched into the background of climbing history. His influence shaped the birth of modern ice climbing, and he helped save Camp 4 from being shut down in the 1990s. Thanks to Jim’s vision, he, Royal Robbins, and Layton Kor would export big wall climbing tactics to international big walls, as they did on their 1963 ascent of Proboscis. In this installment of the AAC’s Legacy Series, Jim McCarthy reflects on these elements of his climbing career and more.