Aidan O'Neill is a practising barrister and member of Matrix Chambers, London. He is also a QC in practice at the Scottish bar. He is Chairman of the Edinburgh Centre for Constitutional Law, and Honorary Fellow in the School of Law of the University of Edinburgh. From 2007 to 2008 Aidan O'Neill was a Visiting Professor in the Woodrow Wilson School of Public and International Affairs, and Senior Research Scholar and Fellow in the Program in Law and Public Affairs, Princeton University. He has published extensively in the fields of human rights, constitutional law and EU law.