John Muir (1838–1914) was a Scottish-American naturalist, environmental philosopher, glaciologist, and early advocate for the preservation of wilderness in the United States. His writings have left a lasting legacy on the American conservation movement, inspiring countless enthusiasts to advocate for and appreciate the natural world. Muir's deep connection with the wilderness, especially the Sierra Nevada in California, fueled his literary output, which includes influential works such as 'The Mountains of California' (1894), 'Our National Parks' (1901), and the book referenced, 'The Treasures of American Nature,' which encapsulates his passion and reverence for the outdoors. Muir's literary style intertwines keen observational detail with a profound spiritual appreciation for nature, often imbuing his works with a poetic sensibility. As a co-founder of the Sierra Club, Muir fought ardently for the protection of landscapes he held dear, leaving an indelible mark on national policy with his contributions leading to the establishment of several national parks. His advocacy is not only captured in his books but also preserved through the establishment of the John Muir National Historic Site in California, ensuring his legacy as a pillar of American environmentalism endures.