The story of how America’s public lands—our city parks, national forests, and wilderness areas—can be traced to a few conservation pioneers and protegees who shaped policy and advocated for open spaces. Some, like Frederick Law Olmsted and Gifford Pinchot, are well known, while others have never been given their due. Jeffrey Ryan covers the nearly one hundred–year period between 1865 (when Olmsted contributed to the creation of Yosemite as a park and created its management plan) to the signing of the Wilderness Act of 1964. Olmsted influenced Pinchot, who became the first head of the National Forest Service, and in turn, Pinchot hired the foresters who became the founders of The Wilderness Society and creators of the Wilderness Act itself. This history emphasizes the cast of characters—among them Theodore Roosevelt, Bob Marshall, Benton MacKaye, Aldo Leopold, and Howard Zahniser—and provides context for their decisions and the political and economic factors that contributed to the triumphs and pitfalls in the quest to protect public lands. In researching the book, Ryan traveled to the places where these crusaders lived, worked, and were inspired to take up the cause to make public lands accessible to all.