Joan DeJeanJoan DeJean is Trustee Professor at the University of Pennsylvania. She is the author of ten books on French literature, history, and material culture, including most recently The Age of Comfort: When Paris Discovered Casual and the Modern ome Began and The Essence of Style: How the French Invented High Fashion, Fine Food, Chic Cafés, Style, Sophistication, and Glamour. She lives in Philadelphia and, when in Paris, on the street where the number 4 bus began service on July 5, 1662. Read More Read Less