John Muir was an influential naturalist, explorer, and conservationist who is best known as the "Father of the National Parks." He was a key figure in the establishment of the Yosemite National Park, and his advocacy for the preservation of wilderness areas helped
From Wikipedia
John Muir, also known as "John of the Mountains" and "Father of the National Parks", was a Scottish-born American naturalist, author, environmental philosopher, botanist, zoologist, glaciologist, and early advocate for the preservation of wilderness in the United States.