On his return to Argentina in 1921, Borges began publishing his poems and essays in surrealist literary journals. He also worked as a librarian and public lecturer. In 1955 he was appointed director of the National Public Library (Biblioteca Nacional) and professor of Literature at the University of Buenos Aires.

His work embraces the "character of unreality in all literature." His most famous books, Ficciones (1944) and The Aleph (1949), are compilations of short stories interconnected by common themes such as dreams, labyrinths, libraries, animals, fictional writers, religion and God. His works have contributed to the genre of science fiction as well as the genre of magical realism, a genre that reacted against the realism/naturalism of the nineteenth century. In fact, critic Angel Flores, the first to use the term, set the beginning of this movement with Borges's Historia universal de la infamia (1935). Scholars also have suggested that Borges's progressive blindness helped him to create innovative literary symbols through imagination. His late poems dialogue with such cultural figures as Spinoza, Camões, and Virgil.
His international fame was consolidated in the 1960s, aided by the "Latin American Boom" and the success of Gabriel García Márquez's Cien Años de Soledad (One Hundred Years of Solitude). Writer and essayist J. M. Coetzee said of him: "He, more than anyone, renovated the language of fiction and thus opened the way to a remarkable generation of Spanish American novelists."
[via - Wikipedia]