who played Machine Head?

Why is the actor that played Machine Head not credited? Is it because he is a friend of Brads? I'm sure he is a solid actor and a real great guy if you just get to know him. Seems kind of harsh. Leaving the solid acting great guy out just because of Brad. What's your beef with Brad? Why all this Brad beef? I'm just curious who this actor is is all. No big deal. I'm sure you have good reasons. Good luck with the film.