Doug Peacock is an American naturalist, outdoorsman, and author. He is best known for his book Grizzly Years: In Search of the American Wilderness, a memoir of his experiences in the 1970s and 1980s, much of which was spent alone in the wilderness of the western United States observing grizzly bears.
Peacock was born in Alma, Michigan, and attended the University of Michigan. He served as a Green Beret combat medic during the Vietnam War and, upon returning, felt so disillusioned with human society that he sought solace in the beauty of the wilderness. Although he had little scientific background, his passion for and firsthand experience with bears soon brought him recognition as an expert in grizzly behavior. He was a friend of author Edward Abbey, and served as the model for the character George Hayduke in Abbey's famous novel The Monkey Wrench Gang.
Peacock's 2005 book, Walking it Off: A Veteran's Chronicle of War And Wilderness, continues his memoirs, in the wake of Ed Abbey's death. He ventured into the southwest deserts to walk off the scars left by his friend's death. In the process, he revisited Vietnam in flashbacks, remembering the cantankerous friendship with Abbey, and almost died in his journey to recover from "this terminal disease called life" in Nepal with his friends Alan Burgess and Dennis Sizemore.