1. Keith Whittington solicited the initial round of articles, while Anthony S. Chen solicited the two “reaction” articles. Chen carried out all other editorial tasks. Eric Schickler is the co-author of a symposium article, and he therefore recused himself from direct involvement in editorial decisions. Robin Einhorn had not yet joined the editorial team when work on the symposium began. Chen would like to thank the authors of the articles for their patience and hard work, two anonymous reviewers for each providing insightful comments on all four of the main symposium articles, Jason Seawright and Laurel Harbridge for helpful methodological conversations, and Kavitha G. Krishanth at NovaTechset for graciously juggling and accommodating all of the unusual requests that the production of a special issue entails.

2. Please note that the authors of these “reaction” articles were not asked to respond to each other.