Question: Which company produced the science fiction hit that the American screenwriter born on September 30, 1946 was involved with? 
Sentence (from "10th World Science Fiction Convention"): However, the 10th Worldcon "was" frequently referred to by its members by the unofficial name Chicon II, so dubbed after the previous Chicago Worldcon (Chicon) in 1940; this name proved so popular that the convention became known as Chicon II in science fiction fandom's lore and written histories.
Relevant evidence: No