Ernest Mandel (1923-1995), was a prominent anti-Stalinist Marxist, political theorist, economist, and orator. His writings, ranging from innovative economic and political theory to a study of the Second World War, were published in over forty languages. His last major work, Late Capitalism, had an influence that stretched across disciplines. From the age of sixteen Mandel became a revolutionary militant and then a key leader of the Fourth International, founded by Leon Trotsky in 1938. Many of his family members died in Nazi concentration camps, but Mandel remained firmly aloof from any form of Zionism. This biography tells of incidents from Mandel's two escapes from the Nazis to his role in Latin American guerrilla warfare. He recounts Mandel's interactions with scholars like Sartre, Ernst Bloch, Perry Anderson, and comrades in arms such as Che Guevara, Rudi Dutschke and Tariq Ali.