He was primarily involved in the making of the first 3 films, with Resurrection and the two Alien vs Predator weren't involved paid off and given producer credits, this applied to Gordon Carroll before his passing in 2005. There some more involvement with Giler and Walter with Ridley Scott on the prequel, if I'm mistaken correct me, dunno if the script he and Walter came out with for their Alien V would be utilize, never the less an amazing contributer to this series is no longer with us and is now amoung the stars.