John Locke (February 19, 1792 – July 10, 1856) was an American naturalist, professor, photographer, and publisher.[1] He was the first American to exhibit photographs to the public.[2] Locke made a geological survey of Ohio in 1838[1] some of which was included in Ephraim George Squier and Edwin Hamilton Davis' Ancient Monuments of the Mississippi Valley (1848).[3] He was elected as a member of the American Philosophical Society in 1844.[4]