Noam Chomsky, born Avram Noam Chomsky, is widely considered to be the father of modern linguistics. His theory of generative grammar has informed generations of linguistic and cognitive researchers. Politically, Chomsky has been active in the discussion of America's foreign and domestic policies since the 1960's. He is also an outspoken critic of the American media, and a prolific author. In fact, according to the Arts and Humanities Citation Index, Chomsky is the most cited author living today.