Samuel Pierpont Langley
The decimation of the species that Hornaday witnessed had a profound effect on him, transforming him into a conservationist. In addition to the specimens for the collection, he acquired live specimens that he brought back to Washington, D.C., which formed the nucleus of the Department of Living Animals he created at the Smithsonian, the precursor to the National Zoological Park, which he helped establish a few years later in 1889. Hornaday served as the zoo's first director, but left soon thereafter after conflict with the head of the Smithsonian, Samuel Pierpont Langley.