Yes, the story of his skiing the Grand Teton is true. I didn't see him do it, but I have it from Bill himself, and to the best of my knowledge he never claimed anything he didn't do.   It was legendary at the time -- he did it back around 1960. It is still astounding to this day, and I don't know if anyone has done it since. He had extraordinary fluid grace on skis, was a fine ski instructor (this later became his winter career), and introduced a great many of us to the European "wedeln" style, then new to the US. Bob