Mountaineer
McDuffie was an accomplished mountaineer in the Sierra Nevada. He made first ascents of Mount Abbot and Black Kaweah.
Along with Joseph N. LeConte and James S. Hutchinson, he pioneered a high mountain route in 1908 from Yosemite National Park to Kings Canyon, roughly along the route of the modern John Muir Trail. In 28 days, they completed a trip of 228 miles through the high mountains, including several previously unexplored sections.
McDuffie suffered from Parkinson's disease for nearly 20 years before his death in 1951. The Sierra peak Mount McDuffie is named after him.
Read more about this topic: Duncan McDuffie