is Professor of Linguistics at University College London. His interests are in Phonological and Morphological Theory and Improved Empirical Foundations of Linguistic Data Collection. Recent research includes: Whistled Languages, Conjunct Agreement, Reduplication, Ergativity, Diminutive Formation, Clitic Restrictions. He is the author of Locality in Vowel Harmony (MIT Press 2010) and co-author of Morphotactics: Basque Auxiliaries and The Structure of Spellout (Springer 2012). He holds a PhD in Linguistics from MIT.