Excerpt from an interview with Katie Jacobs by the awesome Barbara Barnett:
“Hugh has contributed not only in front of the camera, but has contributed in a way nobody else could. He is such a partner.” When Laurie signed on for an eighth season, he was made an “official” executive producer. In fact, early on during this season, he is doubly credited as both star and “executive producer.” Some very observant fans noticed that soon thereafter, his executive producer credit mysteriously disappeared from the opening credits. Although Jacobs isn’t involved in that part of the process, she explained that, true to very modest Laurie’s nature, “he probably doesn’t want the double credit up on the screen. He’s much more demure about these things. He is an executive producer, and rightly so. I don’t think that Hugh even knew it was going to be there; and when he saw it said…no, no, no…don’t want another credit up there! “The truth of the matter is,” Jacobs acknowledged, “there are three people who run this show: David (Shore), myself, and Hugh. Hugh has been contributing in so many ways from the very beginning, which is why the show is so successful. He’s really been an executive producer from the start.”
Also: she tells us that an upcoming episode will feature an original musical composition of Hugh's. :)
Full article is
here - warning, mild spoilers for the next episode.