Karl Heinrich Marx was a German-born philosopher, economist, historian, sociologist, political theorist, journalist, critic of political economy, and revolutionary socialist. His best-known works are the 1848 pamphlet The Communist Manifesto and the three-volume Das Kapital (1867–1894); the latter employs his theory of historical materialism in an analysis of capitalism, representing his greatest intellectual achievement. His theories and ideas, and their subsequent development, are collectively known as Marxism, and have exerted enormous influence on intellectual, economic, and political history.