Ivan Andrew Sag (November 9, 1949 – September 10, 2013) was an American linguist and cognitive scientist.
Born in Alliance, Ohio on November 9, 1949,[1][2] Sag attended the Mercersburg Academy but was expelled shortly before graduation.
[4] Sag received a Mellon Fellowship at Stanford University in 1978–79, and remained in California from that point on.
[5] Sag made notable contributions to the fields of syntax, semantics, pragmatics, and language processing.
In general, his research late in life primarily concerned constraint-based, lexicalist models of grammar, and their relation to theories of language processing.