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Created the Universal Decimal Classification, a bibliographic classification system.

Invented the Dewey Decimal System for library classification.

In the early 19th century, he implemented the closed stacks system in the Library of Congress.

Known for her influential work on the Documentation movement and considered a key figure in the history of information science.

Developed the Five Laws of Library Science and the Colon Classification system.

First African American and first woman to serve as the Librarian of Congress.

He co-authored 'Anglo-American Cataloguing Rules', second edition, which standardizes data entry for library materials.

Founder of OCLC and created the WorldCat library system.

Developed readers' advisory service and promoted open stacks, making it easier for patrons to browse library materials.

Expanded the Library of Congress’s role and helped establish interlibrary loans, making it possible for people to borrow books from other libraries.

Co-authored the 'RSS 1.0 specification', which is used for publishing news updates on the internet and co-founded Reddit, which has had a significant impact on information sharing and dissemination.