John Muir was one of the first advocates of wilderness preservation int he US. Over the course of his life, Muir wrote several books and essays about his experiences in nature. This led to the establishment of such parks as Yosemite and Sequoia National Park. He founded the Sierra Club, which is an important nature conservation organization in the US (Wikipedia, 2010).
This John Muir poster is a just one of several old stock posters in brand new condition provided by MrPearl11. These posters were originally published by Pomegranate in the late 80's-early 90's and have been sealed in their original shipping cartons since.