John Wesley Powell, American soldier, geologist, and explorer (d. 1902)
John Wesley Powell (March 24, 1834 – September 23, 1902) was an American geologist, U.S. Army soldier, explorer of the American West, professor at Illinois Wesleyan University, and director of major scientific and cultural institutions. He is famous for his 1869 geographic expedition, a three-month river trip down the Green and Colorado rivers, including the first official U.S. government-sponsored passage through the Grand Canyon.

Powell who was appointed by Republican President James A. Garfield served as second director of the U.S. Geological Survey (1881–1894) and proposed, for development of the arid West, policies that were prescient for his accurate evaluation of conditions. He became the first director of the Bureau of Ethnology at the Smithsonian Institution during his service as director of the U.S. Geological Survey, where he supported linguistic and sociological research and publications.