Ivan A. Sag
Ivan A. Sag received his PhD in Linguistics from MIT in 1976. He is the Sadie Dernham Patek Professor in Humanities and Professor of Linguistics and Symbolic Systems at Stanford University. He is also a fellow of the American Academy of Arts and Sciences, a fellow of the LSA, and the Edward Sapir Professor at the 2011 Linguistic Institute. Dr. Sag was one of the originators/developers of both Generalzed Phrase Structure Grammar (GPSG) and Head-Driven Phrase Structure Grammar (HPSG). He has worked on numerous syntactic problems and has also made contributions in semantics, experimental and computational linguistics, phonology, and the study of discourse. Focusing on issues at the morphology/syntax and syntax/semantics interfaces, his current research primarily concerns constraint-based, lexicalist models of grammar, and their relation to theories of language processing.
Sign-Based Construction Grammar