John A. Goldsmith is Edward Carson Waller Distinguished Service Professor of Linguistics and Computer Science at the University of Chicago. He is author of Autosegmental and Metrical Phonology (Basil Blackwell, 1990) . Jason Riggle is Assistant Professor of Linguistics and Director of the Chicago Language Modeling Lab at the University of Chicago. He has published in Natural Language and Linguistic Theory, Research on Language and Computation, Linguistic Inquiry and Computational Linguistics . Alan C. L. Yu is Associate Professor of Linguistics and Director of the Phonology Laboratory at the University of Chicago. He is the author of A Natural History of Infixation (2007) and has published in Language , Phonology , and the Journal of Phonetics .