Charles A. (Charles Ammi) Cutter

Born in Boston in 1837, Charles Ammi Cutter became one of the most important American librarians of the 19th century. He studied at Harvard, worked at Harvard College Library, and later served as librarian of the Boston Athenaeum, where he developed many of the practical ideas that made him widely respected in the field.

Cutter is best known for his work on library catalogs and classification. He wrote Rules for a Dictionary Catalog, a major guide to catalog design, and created the Expansive Classification system, which aimed to organize libraries in a flexible, usable way. His name also lives on in "Cutter numbers," the author marks still used in call numbers to help arrange books on shelves.

Alongside his technical work, he was a strong advocate for reader-friendly libraries. Rather than treating catalogs as purely clerical tools, he argued that they should help people actually find what they needed. He died in 1903, but his influence remains visible in library organization long after his lifetime.