Pete was part of a legendary rescue on the North Face of the Grand Teton in 1977. In 2014 the documentary film The Grand Rescue detailed this dangerous adventure.
from the film’s website:
Sinclair, a skilled, experienced chief of mountain rescue at Grand Teton National Park in the 1960’s, had a long mountaineering history, including the first ascent of the West Rib of Denali in 1959. Quiet, and with a philosophical manner, Pete was not easily ruffled. His democratic leadership confirmed the wisdom that allowed his mates to do what each did best during the rescue. Sinclair went on to earn a Ph.D. in English literature, and started his teaching career at the University of Wyoming . A few years later, at the beckoning of Willy Unsoeld, he joined the faculty at Evergreen State College in Olympia , Washington where he remained for three decades until retirement. A lover of stories, he has written widely, including the 1993 book, We Aspired: The Last Innocent Americans. The book was short listed in 1994 for the prestigious Boardman-Tasker Prize at the International Festival of Mountaineering Literature in London. Chapter 10 of We Aspired, entitled “At the Height,” remains today the best description of the 1967 north face rescue.