Ruth Rubio Marín is Professor of Constitutional Law at the University of Sevilla as well as member of the Faculty of The Hauser Global Law School Program at New York University. She is the director of the Gender and Governance Cluster of the School of Transnational Governance at the European University Institute in Florence. Her research represents an attempt to understand how public law creates categories of inclusion and exclusion around different axes including gender, citizenship, nationality and ethnicity. Her most recent works include Transforming Gender Citizenship: The Irresistible Rise of Gender Quotas in Europe, with Éléonore Lépinard (eds), (2018) and, with Will Kymlicka (eds), Gender Parity and Multicultural Feminism: Towards a New Synthesis (2018). Helen Irving is a Professor of Constitutional Law at the University of Sydney. She holds degrees in political science, anthropology, history, and law. She has held visiting positions at the University of Hong Kong, Harvard (with the Harvard Chair of Australian Studies), the London School of Economics, and the European University Institute. She is the author and editor of many works on constitutional history, gender and constitutionalism, and constitutional citizenship, including four monographs published by Cambridge University Press, the most recent Citizenship, Alienage and the Modern Constitutional State: A Gendered History (2016). She has served as an expert adviser to national and international agencies, including the National Archives of Australia, the ABC, International IDEA, UNDP, and UN Women, and is a Fellow of the Academy of the Social Sciences in Australia, Australian Academy of Law, Royal Society of NSW. She was awarded the Australian Centenary Medal in 2003.