Porcupine Tree, a British progressive rock band. He had done extensive work with the band, providing covers and accompanying artwork, similar to the relationship between Gerald Scarfe and Pink Floyd. I just posted a video this morning over on the googles by Steven Wilson, the lead singer of Porcupine Tree, that was created and directed by Lasse Hoile that is pretty much the closest thing we'll ever get to a live action Gamma World movie. Seriously, follow the link above real quick, and tell me I'm wrong. Mutated animals? Check. Mutated plants? Check. Weird Pure Strain Humans with gasmasks? Check. Sounds like Gamma World to me?2
As long as I was at it, though, I figured I'd collect some of his work here, for your enjoyment.