The seeds for this volume were planted in July 2014, as the three of us were exchanging emails about our shared scholarly interest in constitutional amendment. We had been longing for a forum to workshop our papers with colleagues in the field, and so we decided to convene a roundtable on comparative constitutional amendment in Chestnut Hill at Boston College. Our Workshop on Comparative Constitutional Amendment was held on 15 May 2015. We spent the entire day discussing and critiquing papers prepared specifically for the Workshop, and we continued our conversation over a dinner that stretched well into the night. We were hosted with great warmth and generosity by the Clough Center for the Study of Constitutional Democracy, directed by Professor Vlad Perju of Boston College Law School. We also benefited from our partnership with the Research Group on Constitution-Making and Constitutional Change in the International Association of Constitutional Law. We thank them for supporting our Workshop. We thank our friends at Hart Publishing—Bill Asquith, Francesca Sancarlo, Anne Flegel and Claire Banyard—for the opportunity to share the fruits of our Workshop in this published form. We reserve our biggest thanks for the contributors to this volume. We are inspired by their ideas, we are motivated by their hard work, and we are grateful for their friendship. We look forward to continuing the conversation we have begun in this volume, both with them and with our readers.