Joseph Halevi Horowitz Weiler (born 2 September 1951) is an American academic, currently serving as European Union Jean Monnet Chair at New York University Law School and Senior Fellow of the Minda de Gunzburg Center for European Studies, Harvard. He was President of the European University Institute in Florence from 2013 until 2016. He holds a diploma from The Hague Academy of International Law. Weiler is the author of works relating to the sui generis character of the European Union. He is a Fellow of the American Academy of Arts and Sciences. In 2022 he was awarded the Ratzinger Prize by Pope Francis. Career He holds degrees from Sussex (BA); Cambridge (LLB and LLM) and The Hague Academy of International Law (Diploma of International Law); he earned his PhD in European Law at the European University Institute (EUI), Florence, Italy. From 1978 to 1985 he was professor of law and head of the Department of Law at the European University Institute, Florence, where in 1989 he was co-founder of its Academy of European Law. He later served as Professor of Law at the University of Michigan Law School (1985–1992) and as Manley Hudson Professor and Jean Monnet Chair at Harvard Law School (1992–2001). He then moved to New York University Law School. On 7 December 2012 the European University Institute's High Council approved his selection as the European University Institute's new President. He started his term on 1 September 2013 and served through 31 August 2016. He then returned to NYU. He is Visiting Professor at, among others, the University of Paris, the Institut d'Etudes Politiques de Paris (Sciences Po), the Hebrew University of Jerusalem, the Max Planck Institute for International Law at Heidelberg, the College of Europe in Bruges and Natolin, All Souls College, Oxford, Chicago Law School, Stanford Law School, Yale Law School, UCLA School of Law, the Ortega y Gasset Institute, Madrid, the University of Toronto, the University of Frankfurt, the University of Ljubljana, Católica Global School of Law, and the University of Lodz. One of the topics of his specific interest is the influence of (Christian) church on European integration. He coined the term "Christophobia" in his book A Christian Europe: An Exploratory Essay: The term was then popularized by George Weigel's The Cube and the Cathedral. Weiler contributes to the legal theory of European integration, he writes on many areas of EU law (internal market,