Isaac Deutscher (Polish: Izaak Deutscher; 3 April 1907 – 19 August 1967) was a Polish Marxist writer, journalist and political activist who moved to the United Kingdom before the outbreak of World War II. He is best known as a biographer of Leon Trotsky and Joseph Stalin and as a commentator on Soviet affairs. His three-volume biography of Trotsky was highly influential among the British New Left in the 1960s and 1970s. Source: Wikipedia (en)