Helen Irving is a Professor in the Faculty of Law at the University of Sydney, and former Director of the Julius Stone Institute of Jurisprudence. She specialises in Australian and comparative constitutional law, with a particular focus on gender equity and constitutional citizenship. She was active in the recent public debate on proposals for an Australian human rights act, and in the campaign for an Australian republic. During the 1990s, she played a prominent role in events surrounding the (then) approaching Centenary of Federation, and wrote many works on the historical emergence of the Australian Constitution. She was awarded the Centenary Medal in 2003. In 2005-2006, she held the Harvard Chair of Australian Studies, as a Visiting Professor at Harvard Law School. Jacqueline Mowbray is a lecturer in the Faculty of Law at the University of Sydney. She also teaches on the European Regional Masters in Democracy and Human Rights at the Universities of Sarajevo and Bologna. She is a graduate of the Universities of Queensland (BA/LLB (Hons)), Melbourne (LLM) and Cambridge (LLM (Hons)), and in 2008, she completed her PhD at the University of Cambridge, using the theoretical framework of Pierre Bourdieu to examine questions of international law and language policy. Her particular area of interest is international law and legal theory, with a focus on international human rights law. She also teaches in the area of commercial law and has a particular interest in international commercial issues. Jacqueline was admitted as a barrister and solicitor of the Supreme Court of Victoria in 2001, and was admitted as a solicitor in England and Wales in 2004. She joined the New South Wales Bar as an academic barrister in 2009. Kevin Walton is a Lecturer in the Sydney Law School and the Director of the Julius Stone Institute of Jurisprudence at the University of Sydney. He teaches and researches in legal philosophy. Among his particular interests are the methodology of jurisprudence and the moral obligations of citizens.