Karlos Arregi is a Professor at the Department of Linguistics at the University of Chicago. His research interests are in syntax, morphology, and their interfaces with phonology and semantics. A central question in this work is the extent to which grammatical properties of linguistic expressions can be explained in terms of syntax or in terms of principles that regulate its interface of syntax with other modules of grammar. His research tries to illuminate these aspects of linguistic theory by drawing data mostly from Basque and Spanish, as well as other languages such as Washo. Specific topics Dr. Arregi has worked on include syntactic and postsyntactic word formation (especially verbs), agreement and case, pronouns and pronominal clitics, ellipsis, the syntax and phonology of stress, and switch reference.