Question: Which company produced the science fiction hit that the American screenwriter born on September 30, 1946 was involved with? 

<P0-S0> Daniel Thomas "Dan" O'Bannon (September 30, 1946 – December 17, 2009) was an American film screenwriter, director, visual effects supervisor, and occasional actor, usually in the science fiction and horror genres. <SEP> <P1-S0> The 10th World Science Fiction Convention was held on Labor Day weekend from August 30 to September 1, 1952, at the Morrison Hotel in Chicago, Illinois. <P1-S1>  This Worldcon never chose an official name other than the title "10th World Science Fiction Convention," as both the convention's issued membership card and program book clearly stated. <P1-S2>  Only the first Worldcon in New York City (1939) and the 11th in Philadelphia, 1953, shared this lack of a formal convention name. <P1-S3>  The phrases "Tenth Anniversary World Science Fiction Convention" (TAWSFiC) and "Tenth Anniversary Science Fiction Convention" (TASFiC, likely a simple linotype error, as "World" is missing) were each used in some of this Worldcon's pre-convention materials; the phrase's acronyms "TAWSFiC" and "TASFiC" were never officially used in print or otherwise by the Chicago committee at that time. <P1-S4>  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. <SEP> <P2-S0> Bea Mahaffey (1928–1987) was an American science fiction fan and editor. <P2-S1>  She met Raymond Palmer in 1949 at the World Science Fiction Convention in Cleveland, and was hired to assist him at Clark Publications, his publishing company. <P2-S2>  She worked on "Other Worlds" from May 1950; Palmer was incapacitated by an accident for a while shortly after she was hired, though he remained involved from his hospital bed. <P2-S3>  She was listed as coeditor from November 1952 to July 1953 and from May 1955 to November 1955. <P2-S4>  She coedited both "Science Stories" and "Universe Science Fiction" with Palmer, along with the first four issues of "Mystic Magazine", from November 1953 to May 1954. <P2-S5>  Science fiction historians Mike Ashley and E.F. Casebeer both consider that she had a strong positive influence on the magazines, and was probably responsible acquiring for much of the better material Palmer published. <P2-S6>  After Palmer closed his offices in Evanston, Illinois in 1955 Mahaffey continued to work on the magazine by mail from Cincinnati. <P2-S7>  In 1956 an unexpected tax bill forced Palmer to let Mahaffey go, and he ran the magazine by himself from that point on. <SEP> <P3-S0>  The film's title refers to a highly aggressive extraterrestrial creature that stalks and attacks the crew of a spaceship. <P3-S1>  Dan O'Bannon, drawing upon previous works of science fiction and horror, wrote the screenplay from a story he co-authored with Ronald Shusett. <P3-S2>  The film was produced by Gordon Carroll, David Giler and Walter Hill through their company Brandywine Productions, and was distributed by 20th Century Fox. <P3-S3>  Giler and Hill revised and made additions to the script. <P3-S4> Alien is a 1979 science-fiction horror film directed by Ridley Scott, and starring Sigourney Weaver, Tom Skerritt, Veronica Cartwright, Harry Dean Stanton, John Hurt, Ian Holm and Yaphet Kotto. <P3-S5>  Shusett was executive producer. <P3-S6>  The eponymous Alien and its accompanying elements were designed by the Swiss artist H. R. Giger, while concept artists Ron Cobb and Chris Foss designed the more human aspects of the film.