Contributor(s): Professor Brendan O’Leary | Northern Ireland expert, Brendan O’Leary, assesses what we’ve learnt from previous union break-ups to discover the potential futures that may unfold from the UK’s exit from the EU. Brendan O’Leary is Lauder Professor of Political Science at the University of Pennsylvania and an alumnus of LSE. He is the author, co-author, and co-editor of twenty eight books and collections, and the author or co-author of hundreds of articles or chapters in peer-reviewed journals, university presses, encyclopedia articles, and other forms of publication, including op-eds. His latest production is a three-volume study called A Treatise on Northern Ireland. Professor O’Leary is the inaugural winner of the Juan Linz prize of the International Political Science Association for contributions to the study of multinational societies, federalism and power-sharing, and in 2016 he was elected an honorary member of the Royal Irish Academy, principally because of his cont