S. R. Ranganathan, Indian mathematician, librarian, and academic (born 1892)

Shiyali Ramamrita Ranganathan was an Indian librarian and mathematician. His most notable contributions to the field were his five laws of library science and the development of the first major faceted classification system, the colon classification. He is considered to be the father of library science, documentation, and information science in India and is widely known throughout the rest of the world for his fundamental thinking in the field. His birthday is observed every year as National Librarian Day in India.