Matthew Baerman is Principal Research Fellow in the Surrey Morphology Group, University of Surrey. His research focuses on the typology, diachrony and formal analysis of morphological systems, with a particular concentration on phenomena that are unusual or difficult to categorize. He is the co-author (with Dunstan Brown and Greville Corbett) of Morphlogical Complexity (CUP, 2017) and the editor of the Oxford Handbook of Inflection (OUP, 2015). Oliver Bond is a Senior Lecturer in Linguistics in the Surrey Morphology Group, University of Surrey. His research interests include theoretical morphosyntax, typology, and language documentation and description. He is the co-editor, with Greville G. Corbett, Marina Chumakina, and Dunstan Brown, of Archi: Complexities of Agreement in Cross-Theoretical Perspective (OUP, 2016) and, with Andr�s B�r�ny and Irina Nikolaeva, of Prominent Internal Possessors (OUP, 2019). Andrew Hippisley is Professor of Linguistics and Dean of the Fairmount College of Liberal Arts and Sciences at Wichita State University. He is the co-editor of Deponency and Morphological Mismatches (2007, OUP) and co-author of Network Morphology (2012, CUP).