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

Context paragraphs:
Janet Kagan: Janet Kagan (born Janet Megson, April 18, 1946 – February 29, 2008) was an author of two science fiction novels and two science fiction collections, plus numerous science fiction and fantasy short stories that appeared in publications such as "Analog Science Fiction and Fact" and "Asimov's Science Fiction".  Her story "The Nutcracker Coup" was nominated for both the Hugo Award for Best Novelette and the Nebula Award for Best Novelette, winning the Hugo.

10th World Science Fiction Convention: 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.  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.  Only the first Worldcon in New York City (1939) and the 11th in Philadelphia, 1953, shared this lack of a formal convention name.  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.  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.

James Cameron filmography: James Cameron is a Canadian director, screenwriter, and producer who has had an extensive career in film and television.  Cameron's debut was the 1978 science fiction short "Xenogenesis", which he directed, wrote and produced.  In the early part of his career, he did various technical jobs such as special visual effects producer, set dresser assistant, matte artist, and photographer.  His feature directorial debut was the 1981 release "".  The next film he directed was the science fiction action thriller "The Terminator" (1984).  It starred Arnold Schwarzenegger as the titular cyborg assassin, and was Cameron's breakthrough feature.  In 1986, he directed and wrote the science fiction action sequel "Aliens" starring Sigourney Weaver.  He followed this by directing another science fiction film "The Abyss" (1989).  In 1991, Cameron directed the sequel to "The Terminator", "" (with Schwarzenegger reprising his role), and also executive produced the action crime film "Point Break".  Three years later he directed a third Schwarzenegger-starring action film "True Lies" (1994).

Dan O'Bannon: 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.

Columbia Publications: Columbia Publications was an American publisher of pulp magazines featuring the genres of science fiction, westerns, detective stories, romance, and sports fiction.  The company published such writers as Isaac Asimov, Louis L'Amour, Arthur C. Clarke, Randall Garrett, Edward D. Hoch, and William Tenn.  Operating from the mid-1930s to 1960, Columbia's most notable magazines were the science fiction pulps "Future Science Fiction", "Science Fiction", and "Science Fiction Quarterly".  Other long-running titles included "Double Action Western Magazine" (1934–1960), "Real Western" (1935–1960), "Western Action" (1936–1960), "Famous Western" (1937–1960), "Today's Love Stories" (1938–1959), and "Super Sports" (1939–1957).  In addition to pulp magazines, the company also published some paperback novels, primarily in the science fiction genre.

Bea Mahaffey: Bea Mahaffey (1928–1987) was an American science fiction fan and editor.  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.  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.  She was listed as coeditor from November 1952 to July 1953 and from May 1955 to November 1955.  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.  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.  After Palmer closed his offices in Evanston, Illinois in 1955 Mahaffey continued to work on the magazine by mail from Cincinnati.  In 1956 an unexpected tax bill forced Palmer to let Mahaffey go, and he ran the magazine by himself from that point on.

Lewis Colick: Lewis Colick in an American screenwriter born in Brooklyn, New York.  He attended Baruch College in New York and got his MFA in Theatre Arts from the UCLA Film School.

The Philip K. Dick Reader: The Philip K. Dick Reader is a collection of science fiction stories by American writer Philip K. Dick.  It was first published by Citadel Twilight in 1997.  Many of the stories had originally appeared in the magazines "If", "Science Fiction Adventures", "Science Fiction Stories", "Orbit", "Fantasy and Science Fiction", "Imagination", "Future", "Galaxy Science Fiction", "Beyond Fantasy Fiction", "Satellite", "Imaginative Tales", "Fantastic Universe" and "Space Science Fiction".  It is identical in content and order to the edition of volume 3 of the Collected Stories of Philip K. Dick produced by the same publisher apart from the substitution of three stories in positions 21-23 of 24 and the omission of the end notes in the Collected Stories edition.  At press time, stories 21 and 24 had already been made into successful movie adaptations and stories 22 and 23 had been optioned.

John Cox (screenwriter): John Cox is an American screenwriter born and currently residing in Los Angeles, California.  Cox co-wrote the film "Boot Camp" (2007), and the most current draft of Sgt. Rock for Joel Silver and Warner Bros. He also wrote "Virulents" for New Regency and director John Moore.  Unproduced credits include "The Cold" (Warner Bros.), "The 10th Planet" (MGM), and "The Cotton Club Murder" (USA Network).

Alien (film): 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.  The film's title refers to a highly aggressive extraterrestrial creature that stalks and attacks the crew of a spaceship.  Dan O'Bannon, drawing upon previous works of science fiction and horror, wrote the screenplay from a story he co-authored with Ronald Shusett.  The film was produced by Gordon Carroll, David Giler and Walter Hill through their company Brandywine Productions, and was distributed by 20th Century Fox.  Giler and Hill revised and made additions to the script.  Shusett was executive producer.  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.

Supporting paragraphs: Alien (film) Dan O'Bannon
Answer: Brandywine Productions