John Muir: John Muir was an influential early preservationist known for his writings on wilderness conservation, co-founding the Sierra Club, and advocating for the establishment of national parks.
George Catlin: George Catlin was an early preservationist who focused on preserving Native American cultures and their relationship with nature. He believed that protecting their lands was essential to their survival.
Henry David Thoreau: Thoreau was an American writer and philosopher who emphasized living in harmony with nature. His book "Walden" encouraged people to appreciate and protect the natural world.