Galen Clark (March 28, 1814 – March 24, 1910) was a British North America-born American conservationist and writer. He is known as the first European American to discover the Mariposa Grove of Giant Sequoia trees, and is notable for his role in gaining legislation to protect it and the Yosemite area, and for 24 years serving as Guardian of Yosemite National Park. Source: Wikipedia (en)