 José Ortega y Gasset (1883–1955) was a prolific and distinguished Spanish philosopher in the twentieth century. In the course of his career as philosopher, social theorist, essayist, cultural and aesthetic critic, educator, politician and editor of the influential journal, Revista de Occidente, he has written on a broad range of themes and issues. Among his many books are: Meditations on Quixote (1914), Invertebrate Spain (1921), The Theme of Our Time (1923), Ideas on the Novel (1925), The Dehumanization of Art (1925), What is Philosophy? (1929), The Revolt of the Masses (1930), En Torno a Galileo [Man and Crisis] (1933), History as a System (1935), Man and People (1939–40), The Origin of Philosophy (1943), The Idea of Principle in Leibnitz and the Evolution of Deductive Theory (1948). In addition to these books, he also wrote hundreds of essays and newspaper and magazine articles, the most important of which are collected in twelve volumes, several of which have been translated into English, French and German. His major writings reveal an intellectual development that traversed the life-world experiences articulated in the perspectives of phenomenology, historicism and existentialism.