Mount Muir is a peak in the Sierra Nevada of California, 0.95 miles south of Mount Whitney. This 14,018-foot peak is named in honor of John Muir, a geologist, conservationist and founder of the Sierra Club. The southernmost section of the John Muir Trail contours along the west side of Mount Muir near its summit and ends on the summit of Mount Whit…Mount Muir is a peak in the Sierra Nevada of California, 0.95 miles south of Mount Whitney. This 14,018-foot peak is named in honor of John Muir, a geologist, conservationist and founder of the Sierra Club. The southernmost section of the John Muir Trail contours along the west side of Mount Muir near its summit and ends on the summit of Mount Whitney.