An anthology like this is only possible because of all the people who enjoy writing and reading about imaginary worlds, and I am grateful to see this interdisciplinary area of study increasing in academia over the years. I would like to thank video game designer Scott Adams for his Foreword, and for all the work he has done to advance world-building in text adventure games. A hearty thanks go to all the contributors, Lily Alexander, Helen Conrad-O’Briain, Christopher Hanson, Andrew Higgins, Jennifer Harwood-Smith, Matt Hills, Edward James, Kara Kennedy, Lars Konzack, Edward O’Hare, and William Proctor for their participation and great essays, and for the on-line conversations we have had regarding imaginary worlds. I am also grateful for the enthusiasm and encouragement of Erica Wetter at Routledge, and the anonymous book proposal reviewers for their thoughtful and thorough reviews. Thanks also to my wife Diane and my sons Michael, Christian, and Francis, who put up with me during the time while I was working on this book. And, as always, thanks be to God, the Creator of all subcreators.