Tom Woodruff Jr and Harry Harrison with the alien costume from "Aliens".

Woodruff is one of the head honchos of Amalgamated Designs Incorporated (ADI), who designed and built the aliens for "Alien 3", "Alien: Resurrection" and "Alien vs Predator". He and his partner Alec Gillis (not shown) also worked under Stan Winston on "Aliens". Woodruff himself is frequently the man actually inside the suit. He and Gillis were doing autographs at the convention, but I was lucky enough to catch him doing a press junket with Harrison.

Harry Harrison is the lucky guy who has collected props from all the "Alien" films, and even has the alien queen in a specially-built extension to his house. All the items in the exhibition came from his private collection. You can see his full collection here.