John Muir, the most famous naturalist in American history, protected Yosemite, co-founded the Sierra Club, and is sometimes called the Father of the National Parks. A poor immigrant, self-taught, individualistic, and skeptical of institutions, his idealistic belief in the spiritual benefits of holistic natural systems led him to a philosophy of preserving wilderness unimpaired. Gifford Pinchot founded the U.S. Forest Service and advised his...