Today, Edge is most widely remembered for establishing Hawk Mountain Sanctuary, the world's first refuge for birds of prey. Founded in 1934 and located in eastern Pennsylvania, Hawk Mountain was cited in Silent Spring as an "especially significant" source of data. In 1930, Edge formed the militant Emergency Conservation Committee, which not only railed against the complacency of the Bureau of Biological Survey, Audubon Society, U.S. Forest Service, and other stewardship organizations but also exposed the complicity of some in the squandering of our natural heritage. Edge played key roles in the establishment of Olympic and Kings Canyon National Parks and the expansion of Yosemite and Sequoia National Parks. Filled with new insights into a tumultuous period in American conservation, this is the life story of an unforgettable individual whose work influenced the first generation of environmentalists, including the founders of the Wilderness Society, Nature Conservancy, and Environmental Defense Fund.