S.R. Ranganathan was an Indian librarian and library scientist who is considered one of the pioneers of library science. He was born on August 9, 1892, in Erode, Tamil Nadu, India. Ranganathan received his education in India and England, and began his career as a librarian in India in the 1920s. He went on to become one of the leading figures in the field of library science, and is known for his contributions to the development of systems and theories of library organization and classification, such as the Colon Classification system and the Five Laws of Library Science. Ranganathan died on September 27, 1972, in Bangalore, India.