This book is open access and available on www.bloomsburycollections.com. It is funded by Knowledge Unlatched. In his lead essay, Tully applies his distinctive philosophy to the global field of citizenship. The second part of the book contains responses from influential interlocutors including Bonnie Honig and Marc Stears, David Owen and Adam Dunn, Aletta Norval, Antony Laden, and Duncan Bell. These provide a commentary not just on the ideas contained in this volume, but on Tully's approach to political philosophy more generally, thus making the book an ideal first source for academics and students wishing to engage with Tully's work. The volume closes with a response from Tully to his interlocutors. This is the opening volume in Bloomsbury's Critical Powers series of dialogues between authors and their critics. It offers a stimulating read for students and scholars of political theory and philosophy, especially those engaged with questions of citizenship. It is an ideal first source for academics and students wishing to engage with Tully's work.