Joseph Halevi Horowitz Weiler (born 1951 in Johannesburg, South Africa) is Joseph Straus Professor of Law and European Union Jean Monnet Chair at New York University Law School and President of the European University Institute in Florence. 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. 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.