Melvil Dewey was an American librarian who is responsible for the creation of Dewey's decimal classification, which facilitated the book classification system within libraries and revolutionized the view of readers and librarians on libraries as public institutions. Through the Mundaneum, scientist Paul Otlet tried to unify world knowledge in one place and classify it. His vision and conception is visible today through the Internet, which actually contains knowledge in one place. Vannevar Bush was an American who contributed to the technical aspects of information science. S. R. Ranganathan is also known as the „father of Indian library science“ because he started the library activity in India with his work and effort. He transformed libraries from closed and inaccessible institutions into educational centers. Jesse Shera saw the need to connect library activities with information technologies because he believed that this would make the work of librarians easier, and not only that, but he also foresaw the dangers of this connection. Eugene Garfield was a pioneer in database searching, his work made it easier for scientists around the world to access information. When looking at the Croatian space, the pioneer was certainly Božo Težak, who followed world trends, defined information science and worked to ensure that the development of information science in Croatia did not lag behind.