Donald Worster's A Passion for Nature is the most complete account of the great conservationist and founder of the Sierra Club ever written. It is the first to be based on Muir's full private correspondence and to meet modern scholarly standards, yet it is also full of rich detail and personal anecdote, uncovering the complex inner life behind the legend of the solitary mountain man. It traces Muir from his boyhood in Scotland and frontier Wisconsin to his adult life in California right after the Civil War up to his death on the eve of World War I. It explores his marriage and family life, his relationship with his abusive father, his many friendships with the humble and famous (including Theodore Roosevelt and Ralph Waldo Emerson), and his role in founding the modern American conservation movement. Inspired by Muir's passion for the wilderness, Americans created a long and stunning list of national parks and wilderness areas, Yosemite most prominent among them. Yet the book also describes a Muir who was a successful fruit-grower, a talented scientist and world-traveler, a doting father and husband, and a self-made man of wealth and political influence. The winner of numerous book awards, A Passion for Nature was also named a Best Book of 2008 by Washington Post Book World . It is the first comprehensive biography of Muir to appear in six decades.

Donald Worster is Hall Distinguished Professor of American History at the University of Kansas and the author of many books including A River Running West, the Bancroft Prize-winning Dust Bowl, and Under Western Skies: Nature and History in the American West.