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Robbins was a pioneer of American rock climbing who completed an impressive list of first ascents throughout the 50s, 60s and 70s. Many of these were in Yosemite Valley, and included major classics such as the Northwest Face of Half Dome (1957), the Salathé Wall on El Capitan (1961), the North America Wall on El Capitan (1964) and Tis-sa-ack on Half Dome (1969).
Robbins' climbing ethics were also pioneering, as he championed the cause of "clean" (i.e. hammerless) climbing in an era when the use of pitons and bolts was regarded as standard practice.