Who is William Clark from the Lewis and Clark expedition?

William Clark (August 1, 1770 - September 1, 1838) was an American explorer, soldier, Indian agent, and territorial governor. A native of Virginia, he would also grow up in pre-statehood Kentucky before later settling in what later became the state of Missouri. Along with Meriwether Lewis, Clark led the Lewis and Clark Expedition of 1803 to 1805 across the Louisiana Purchase to the Pacific Ocean. Before the expedition he served in a militia and the United States Army, while afterwards he served in a militia and as governor of the Missouri Territory. From 1822 until his death he held the position of Superintendent of Indian Affairs.