Gregory Grefenstette (born April 25, 1956) is a French-American researcher and professor of computer science, in particular of artificial intelligence and natural language processing.
Following his PhD work on "Exploring Automatic Thesaurus Generation", he mostly addressed large-scale natural language processing problems and co-edited with Adam Kilgarriff a special issue of Computational Linguistics on using the Internet as a corpus for machine learning.
Prior to that, he was the chief science officer of Exalead, a search engine company, managing the OSEO QUAERO CMSE program on innovative multimedia indexing technologies.
[4] With his research team, he has received awards for his work on semantic maps and won a three-year grant from the Lagardere Foundation in 2007.
Referenced in many natural language processing research papers, Grefenstette is especially known for his work on cross-language information retrieval and distributional semantics.