John Muir is most famous for his role in creating the Yosemite, Sequoia, Mount Rainier and Grand Canyon national parks. Without Muir's drive to have these beautiful natural area's preserved, the United States might be missing some of its most beautiful places.
Muir was also well known as a travel guide, founder of the Sierra Club and an author. He wrote many articles about the situation in the country concerning nature and its gifts. It was these types of articles that helped push the U.S. government to create Yosemite National Park in 1890. The Sierra Club which created a lot of advocates for protecting the country's resources and introduced a lot of people the beauty that makes up the U.S. was established in 1892.