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Sadie Dernham Patek Professor in Humanities Emerita. Leading figure in syntactic theory. Originated the theory of Lexical-Functional Grammar and some of its probabilistic extensions. Conducted quantitative investigations showing that grammar is inherently variable in nature, a highly plastic cognitive system sensitively tuned to the frequencies of the environment. Member of the National Â鶹´«Ã½ÍøÕ¾ of Sciences, recipient of the Lifetime Achievement Award from the Association of Computational Linguistics, former President of the Linguistic Society of America, an inaugural Fellow of the LSA, a Fellow of the American Â鶹´«Ã½ÍøÕ¾ of Arts and Sciences, a Corresponding Fellow of the British Â鶹´«Ã½ÍøÕ¾, a Fellow of the Cognitive Science Society, a Fellow of the Center for the Advanced Study of the Behavioral Sciences, and a Guggenhiem Fellow, among other distinctions.