Patricia Popelier is Full Professor of Constitutional Law at the University of Antwerp, director of the Research Group on Government and Law, Senior Research Fellow at the University of Kent, Centre for Federal Studies and co-promoter of the Centre of Excellence GOVTRUST. Giacomo Delledonne is Assisant Professor of Comparative Constitutional Law at the Scuola Superiore Sant'Anna, Pisa, Italy. Nicholas Aroney is Professor of Constitutional Law and Fellow of the Centre for Public, International and Comparative Law at the University of Queensland.