Warren Breckman is the Sheldon and Lucy Hackney Professor of History at the University of Pennsylvania.  He is the author of Adventures of the Symbolic: Post-Marxism and Radical Democracy (2013), European Romanticism (2007), and Marx, the Young Hegelians, and the Origins of Radical Social Theory: Dethroning the Self (1999), and co-editor of The Cambridge History of Modern European Thought (two volumes, 2019).