François Vergniolle De Chantal François Vergniolle de Chantal is Professor of American Politics and Government at Université de Paris. He is the author and editor of several books on the US presidency in both French and English. He is the author of L'impossible présidence impérale: Le contrôle législatif aux États-Unis (CNRS Éditions Paris, 2016). His research focuses on US political institutions, American Congress, and ideologies and political thought. Read More Read Less