Ernest Mandel (1923-1995) was a theorist of activist Marxism. Leader of the international Trotskyist movement, lifelong revolutionary, and scholar of world renown, Mandel was one of those few individuals who combined the roles of political leader and respected intellectual.

Contributors include Robin Blackburn, Norman Geras, Michael Lowy, Charles Post, Francisco Louca, Michel Husson, Jesus Albarracin, Pedro Montes, and Catherine Samary.