Vagueness in the Law: Philosophical and Legal Perspectives

Prof. Dr. Ralf Poscher is Professor of Public Law and Legal Philosophy at Albert-Ludwigs-University of Freiburg and managing director of the Centre for Security and Society of the University of Freiburg. Prof. Poscher has been a Fernand Braudel Senior Fellow at the European University Institute in Florence (2013), a guest researcher of the Program in Law and Public Affairs at Princeton University (2012), a member of the Institute for Advanced Study in Princeton,USA (2007-2008), and a visiting professor at the University of Osaka (2007). His areas of research cover legal theory, fundamental rights and national security law. Geert Keil is Professor of Philosophy at Humboldt University of Berlin. His main areas of research are the philosophy of mind and action, epistemology, philosophical anthropology and metaphysics. Awarded with a Heisenberg scholarship of the German Research Foundation (DFG) and a Feodor Lynen scholarship of the Alexander von Humboldt Foundation, he researched at the Universities of Trondheim, Stanford, and Basel. From 2005 to 2010 he held a chair in theoretical philosophy at RWTH AachenUniversity.