Melvil Dewey, American librarian and educator, created the Dewey Decimal Classification (b. 1851)
Melville Louis Kossuth "Melvil" Dewey (December 10, 1851 – December 26, 1931) was an influential American librarian and educator, inventor of the Dewey Decimal system of library classification, a founder of the Lake Placid Club, and a chief librarian at Columbia University. He was also a founding member of the American Library Association but resigned in 1905, due to allegations of sexual harassment, racism, and antisemitism.