Michael Löwy is a French-Brazilian Marxist sociologist and philosopher, and emeritus research director in social sciences at the National Centre for Scientific Research (CNRS) in Paris. His many books include The Theory of Revolution in the Young Marx and On Changing the World. Paul Le Blanc, long-time activist and Professor of History at La Roche College, is the author of a number of widely-read studies, including Lenin and the Revolutionary Party, From Marx to Gramsci, and Marx, Lenin and the Revolutionary Experience. With Michael Yates he has written the widely-acclaimed A Freedom Budget for All Americans and has co-edited a selection of Leon Trotsky's Writings in Exile.