The essays in this collection celebrate Ken Hale's lifelong study of underdocumented languages and their implications for universal grammar. The authors report their latest research in syntax, morphology, semantics, phonology, and phonetics. Contributors: Elena Anagnostopoulou, Noam Chomsky, Michel DeGraff, Kai von Fintel, Morris Halle, James Harris, Sabine Iatridou, Roumyana Izvorski, Michael Kenstowicz, Samuel Jay Keyser, Shigeru Miyagawa, Wayne O'Neil, David Pesetsky, Hyang-Sook Sohn, Kenneth N. Stevens, Ester Torrego, Cheryl Zoll.