Photographer and filmmaker Glen Denny was one of the denizens of Camp 4 in the 1960s. He scaled the big walls of Yosemite Valley with many of the climbing icons of the '60s, including Warren Harding, Royal Robbins, Tom Frost, Yvon Chouinard, Chuck Pratt, and Layton Kor. Camera in hand, Glen captured both the gritty reality and the sunny optimism of those years on film.