"David Marshall’s well-researched account of frontiersman John Colter combines tales of wild country with the details of survival, endurance, and grit. You can travel his paths through Yellowstone and the Tetons today and imagine, while inhaling the sulfur of Colter’s Hell, that you are there alone, in winter, warmly wrapped in a buffalo robe." -Jonathan B. Jarvis, Director of the National Park Service, 2009-2017