Peacock has devoted the last 20 years to saving the grizzly bear. Like many veterans, he had trouble adjusting when he returned from Vietnam. He sought a life of seclusion in the mountains and it was then that he first encountered grizzly bears. Now, he performs research alone through the mountains of Wyoming and Montana studying the behavior, social hierarchy, and communication methods of grizzlies in their natural habitat. In addition to his several books, he recently contributed to "Mark of the Bear: Legend and Lore of An American Icon."
After serving in the Vietnam War, Peacock sought solace in nature. While camping in the woods, he had several encounters with grizzly bears. He wrote about his observations of the animals in his new book, Grizzly Years.