John Muir was a Scottish-born naturalist, writer, and early advocate for wilderness preservation in the United States. Born in Dunbar, Scotland, in 1838, he later immigrated to America, where he became a prominent botanist, glaciologist, and essayist. He is widely recognized for his efforts to protect natural landscapes, including the Yosemite Valley and Sequoia National Park. As a co-founder of the Sierra Club, Muir's influential writings and spiritual connection to the natural world helped shape modern environmental philosophy and the establishment of the American national park system.