Dewey, Melvil (1851–1931)
US librarian. In 1876, he devised the Dewey decimal system of classification for accessing, storing, and retrieving books, widely used in libraries. The system uses the numbers 000 to 999 to designate the major fields of knowledge, then breaks these down into more specific subjects by the use of decimals.
Dewey founded the American Library Association in 1876 and the first school of library science, at Columbia University, in 1887.
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