Yes, he has, but most of his work has been replaced by current research.
> Has Chumpsky actually done any work in the field for which he is paid in the last 30 years? <
Absolutely. Entirely apart from his terrible political philosophy, he has had a HUGE impact as a scholar. He has had an important output of publications, and perhaps more significantly, his ideas have shaped a whole generation or two of younger linguists.
Until recently, in fact, almost everyone in linguistics considered Chomsky the world’s number one linguistic scientist, not to mention his substantial influence in the field of cognitive psychology. Quite a few people have even looked upon his intellectual contributions as being equal to those of Newton, Maxwell or Einstein.
In the last few years, however, Noam’s ideas have steadily fallen out of favor — so much so that many prominent linguists and cognitive psychologists now feel Chomsky basically led their disciplines down a blind alley.