Jim Bridger may be most famous for being, as a youth, one of the two mountain men who abandoned famed trapper Hugh Glass after he had been mauled by a grizzly bear. It was Hugh's thoughts of revenge for this abandonment that fueled his recovery and eventual tracking down of the young Bridger.

James Bridger, known as Jim Bridger (1804 – 1881), was among the foremost mountain men, trappers, scouts and guides who explored and trapped the Western United States during the decades of 1820–1850, as well as mediating between native tribes and encroaching whites.

From inside the book:
The western plains and mountains brought forth thousands of men noted for their valor, bravery, daring, sagacity, woodcraft, frontiersmanship and skill in guiding wagon trains and military expeditions across the trackless prairie and barren desert and through snow capped mountain fastnesses on the way to the land of gold beyond the setting sun, or in trailing and bringing to bay the savage hordes that sternly fought the advances of civilization; but among those dauntless spirits there was one who stood head and shoulders above all others as the greatest scout, trapper and guide, the most skilled frontiersman, and the quietest, most modest and unassuming prairie man in all the west. That person was James Bridger, Major Bridger, or, as he was more commonly and familiarly known, "old Jim Bridger," the "grand old man of the Rockies." No history of the American western frontier would be complete without a sketch of the life of this remarkable man.