Sophia Rosenfeld is Walter H. Annenberg Professor of History at the University of Pennsylvania, where she teaches European intellectual and cultural history with a special emphasis on the Enlightenment, the trans-Atlantic Age of Revolutions, and the legacy of the eighteenth century for modern democracy. She is the author of A Revolution in Language: The Problem of Signs in Late Eighteenth-Century France; Common Sense: A Political History; and Democracy and Truth: A Short History. She is currently co-editing a six-volume book series for Bloomsbury on the cultural history of ideas since antiquity. She is also writing a book on how the idea and practice of making choices from menus of options became central to modern conceptions of freedom.