Neil Walker holds the Regius Chair of Public Law and the Law of Nature and Nations at the University of Edinburgh. His main area of expertise is constitutional theory. He has published extensively on the constitutional dimension of legal order at sub-state, state, supranational and global levels. He was Professor of European Law at the European University Institute, Florence (2000–8), and has held various visiting appointments. His most recent books include Intimations of Global Law (Cambridge, 2014) and The Scottish Independence Referendum: Constitutional and Political Implications (co-edited with Aileen McHarg, Tom Mullen, Alan Page, 2016).