Ivan Sag is a professor of linguistics at Stanford University. With Carl Pollard, he has written several books that introduce and develop the syntactic theory known as Head-driven phrase structure grammar (HPSG). He was also involved with work on Generalized phrase structure grammar, HPSG's immediate intellectual predecessor. In addition, he has written numerous articles on problems of linguistic theory and analysis.
His research interests include long-distance dependencies (known more popularly as Wh-Movement), the English auxiliary system, various issues related to the syntax/semantics interface, and syntactic theory's relationship to language processing. His recent work has looked to integrate ideas from Construction Grammar with ideas already present in HPSG.
Sag got his PhD from MIT, writing his dissertation (advised by Noam Chomsky) on ellipsis.
Interestingly, he earlier received an MA from the University of Pennsylvania, where he studied comparative Indo-European languages, Sanskrit, and sociolinguistics, and a BA from the University of Rochester.
Sag, Ivan A. Coordination and Underspecification In Jongbok Kim and Stephen Wechsler, eds., Proceedings of the Ninth International Conference on Head-Driven Phrase Structure Grammar, Kyung-Hee University, Seoul.
Sag, Ivan A., Timothy Baldwin, Francis Bond, Ann Copestake and Dan Flickinger.
Ginzburg, Jonathan, Ivan A. Sag, and Matthew Purver.
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