John Muir (1838 –1914) also known as ‘John of the Mountains’ and ‘Father of the National Parks’, was an influential Scottish-American naturalist, author, environmental philosopher, botanist, zoologist, glaciologist, and early advocate for the preservation of wilderness in the United States of America. His activism helped to preserve the Yosemite Valley and Sequoia National Park, and his example has served as an inspiration for the preservation of many other wilderness areas.
-Wikipedia