Sophia Rosenfeld is Walter H. Annenberg Professor of History at Penn, 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 (Stanford, 2001); Common Sense: A Political History (Harvard, 2011); and Democracy and Truth: A Short History (Penn, forthcoming).  Her articles and essays have appeared in the American Historical Review, the Journal of Modern History, French Historical Studies, and the William and Mary Quarterly, as well as The New York Times, The Washington Post, Dissent, and The Nation, and she is a former editor of Modern Intellectual History.  Currently, she is co-editing (with Peter Struck) a six-volume book series for Bloomsbury on the cultural history of ideas since antiquity and writing a book, to be published by Princeton, on how the idea and practice of choice-making became so central to modern conceptions of freedom.