George Bird Grinnell, the son of a New York merchant, saw a different future for a nation in the thrall of the Industrial Age. With railroads scarring virgin lands and the formerly vast buffalo herds decimated, the country faced a crossroads: Could it pursue Manifest Destiny without destroying its natural bounty and beauty? The alarm that Grinnell sounded would spark America’s conservation movement. Yet today his name has been forgotten—an omission that John Taliaferro’s commanding biography now sets right with historical care and narrative flair.