John Colter (c.1774 – May 7, 1812 or November 22, 1813) was a member of the Lewis and Clark Expedition (1804–1806). Though a part of the more famous expeditions in history, Colter is best remembered for explorations he made during the winter of 1807–1808, when he became the first white person to encounter the geothermal wonders of the Yellowstone and to see the Teton Mountain Range. Colter spent months alone in the brutal Wyoming winter wilderness and is widely considered to be the first, known, mountain man.
Davey Jackson (1790 – 1837) Pioneer, explorer, trader and fur trapper; uncle to Stonewall Jackson. In the spring of 1822, he responded to an ad in the St. Louis Enquirer for a job with William Ashley’s fur company. In 1826, he and two other fur trappers, Jedediah Smith and William Sublette, bought out Ashley’s operations and Jackson then managed part of the business. In 1828-29, Jackson wintered among the Flathead Indians and explored the area around Jackson Hole, Wyoming, which, along with Jackson Lake, is named for him.