Charles Ammi Cutter
Charles Ammi Cutter (March 14, 1837 – September 6, 1903) is an important figure in the history of American library science. The magnum opus of Cutter's bibliographic pilgrimage came in 1880 when he introduced the Athenaeum and eventually the library world to an avant-garde and divergent system of cataloging he termed Cutter Expansive Classification. This system incorporated seven levels of classification with the most basic libraries operating at the first level and the grandest, most distinguished institutions utilizing the seventh level, and it was Cutter's aspiration to orchestrate a classification system for every type of library.
