Scottish-American preservationist John Muir (pictured) founded the environmental organization Sierra Club in California.

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.

The Sierra Club is an American environmental organization with chapters in all 50 U.S. states, Washington D.C., and Puerto Rico. The club was founded in 1892, in San Francisco, by preservationist John Muir. A product of the progressive movement, it was one of the first large-scale environmental preservation organizations in the world. It has lobbied for policies to promote sustainable energy and mitigating global warming, as well as opposing the use of coal, hydropower, and nuclear power. Its political endorsements generally favor liberal and progressive candidates in elections.