Matthew studied law and criminology at University of Cambridge and received his DPhil from University of Oxford in Socio-Legal Studies. He is currently the Dean of the Faculty of Humanities and Social Sciences at the University of Portsmouth, and has over thirty years' experience in Higher Education. He was formerly Professor of Law and Policy and Pro-Vice-Master at Birkbeck, University of London, and has held academic posts at the University of Oxford, Keele University and the Open University. Matthew has published widely on the impact of criminal laws and criminal justice enforcement practices on people living with HIV, and those belonging to key or “at risk” populations. He was called to the Bar, and is a Bencher of the Honourable Society of the Middle Temple, but does not practise.