John Muir in Historical Perspective revises and expands popular understanding of Muir's significance. It unearths new material on Muir's famous first summer in Yosemite and his influence on other environmentalists in California and beyond. It offers new insights into his relationship with his family and friends, as well as analyzes Muir's importance in terms of literary and religious themes. This is a valuable addition to the growing literature on John Muir.