Yes, and he appears to harbor a grudge against the Guardian, which you can see by the number of inflammatory articles tagged Guardian on his blog.

While it's quite possible that among all news sources, Jonathan Cook seems to have worked for the one horrific news source in the world, and is doing us a service by constantly exposing their acts, Occam's razor would suggest otherwise.

I've read a sampling of his articles, and he seems to be either an extremist, or someone who wishes to profit by appearing to be one. His posts seem mostly to be lacking a bit in rational discourse (with gems like "As far I can tell, none of the facts in the Guardian’s story is untrue. But that does not stop it from being a blatant lie"), and without much diversity in subject.