(By the way, if you haven't seen Rosewater -- and most people haven't -- it's really quite good. Unfortunately, his distributor really did an awful job getting the film out. There were no screenings of it during Awards Season, and it even took Netflix a long while to make it available. But the screenplay is smart, and moves along pretty well, and there are some very good directorial touches, most especially for a first-time director.)
The article is titled, "Why I Quit The Daily Show, but that's a bit deceptive. He does talk about it at length, but it's not like there's some Great Revelation, just a general discussion of how his thinking led him to the decision. And most of the article is about many other things. Anyway, you can read the interview here.