Robert Campbell (1804-1879) - Fur trader, merchant and Indian Commissioner, Campbell was born in Ireland on February 4, 1804. He immigrated to America in 1822 and two years later was in St. Louis, Missouri. There, he was advised to lead an outdoor life because of tuberculosis and joined Jedediah Smith on an expedition to the Rocky Mountains in late 1825. In 1832, he joined with famed trapper, William L. Sublette in a partnership, directly competing with the  American Fur Company. That same year, he participated in the Battle of Pierre's Hole in present-day Idaho. Suffering reverses, they confined their activities to the mountain territory and they dissolved the partnership in 1842. He then returned to St. Louis, where he began to work as a merchant. He attended the Fort Laramie treaty gathering in 1851 and during the Mexican-American War, helped form a regiment which he commanded. Diversifying his business interests, he soon became involved in real estate and banking. He prospered until his death in St. Louis on October 16, 1879.

William Clark (1770-1838) - Born on August 1, 1770 in Caroline County, Virginia, Clark moved with his family to Louisville, Kentucky in 1785. After receiving a quality education and becoming a geographical expert, he joined the militia in 1789. In 1796 he left the army and in 1803, Captain Meriwether Lewis invited him to share the leadership in the Corps of Discovery. For the next three years, they and their men explored the vast uncharted area newly acquired in the Louisiana Purchase, with Clark acting as mapmaker and artist. After Clark's successful return from the Pacific coast three years later, President Jefferson awarded him 1,600 acres and made him brigadier general of militia for the Louisiana Territory as well as superintendent of Indian affairs. From 1813 to 1832, Clark served as governor of the Missouri Territory. Clark died of natural causes in St. Louis on September 1, 1838. More ... 

 John Colter (1774?-1813) - Frontiersman, explorer, fur trapper, mountain man, and army scout credited with the being the discoverer of the Yellowstone area. - See full article HERE.

William Craig (1807-1869) - A frontiersman and trapper, Craig was born in Greenbriar County, West Virginia in 1807. Allegedly, he left home after killing a man in self-defense, and soon headed to the Pacific Northwest, probably with William Sublette and other fur traders. He also trapped with Jedediah Smith in the Blackfoot country until he joined Joe Walker's California Expedition of 1833-34. In 1836, he and others established a trading post known as Fort Davy Crockett in Brown's Hole, Colorado. He acted as a guide to a missionary party to Fort Hall, Idaho and on the the Whitman Mission near Walla Walla, Washington. He then established a farm near Lapwai, Idaho. Somewhere along the line, he married a Nez Perce woman and was friendly with the tribe. In 1856, he became the Indian Agent for the Cayuse tribe and occasionally scouted for the army. He died of  a stroke in 1869.

David "Davy" Crockett (1786-1836) - A frontiersman, explorer and pioneer, David de Crocketagne was born on August 17, 1786, near Limestone, Kentucky, Crockett  fought in the Creek Indian War under Andrew Jackson, before taking up the life of a politician. He represented Tennessee in the state legislature and then as a representative in the U.S. Congress.  However, when he lost the re-election in 1835, he said "you may all go to hell, and I will go to Texas." He joined the Texas Revolution in the fall of 1835 and in February, 1846, he arrived at the Alamo with his group of Tennessee Mounted Volunteers. Fighting against Santa Anna during the siege of the Alamo, he lost his life on March 6, 1836, along with 189 defenders.