Question: Which American Screenwriter utilized Saturn Films for the production of The Family Man? 

Context paragraphs:
David Diamond (screenwriter): David Diamond is an American screenwriter.  His film credits include "The Family Man", "Old Dogs", "When in Rome", "Evolution" and the television film "Minutemen".

Saturn Award for Best New Media Television Series: The Saturn Award for Best New Media Television Series is one of the annual awards given by the American Academy of Science Fiction, Fantasy & Horror Films.  The Saturn Awards, which are the oldest film and series-specialized awards to reward science fiction, fantasy, and horror achievements, included the category for the first time at the 42nd Saturn Awards ceremony, when the Saturn Award went through major changes in their television categories.  It specifically rewards web television series series created for non-traditional platforms such as Netflix or Amazon Video.

Saturn Aura: The Saturn Aura is a midsize family sedan that was produced by Saturn.  It debuted as a concept car at the North American International Auto Show in January 2005.  The production model of the AURA was shown at the 2006 New York Auto Show in April, with production commencing in North America in the summer of 2006 for the 2007 model year.  The Aura replaced the Saturn L-Series, which was discontinued after the 2005 model year.  Although Saturn had never intended to use the Aura name for the production vehicle, the name ended up sticking as a result of the popularity of the concept.

Saturn Films: Saturn Films is a film production company established by actor Nicolas Cage.

The Family Man: The Family Man is a 2000 American romantic comedy-drama film directed by Brett Ratner, written by David Diamond and David Weissman, and starring Nicolas Cage and Téa Leoni.  Cage's production company, Saturn Films, helped produce the film.  The film centers on a man who sees what could have been had he made a different decision 13 years prior.

Saturn Award for Best Director: The Saturn Award for Best Director (or Saturn Award for Best Direction) is one of the annual awards given by the American Academy of Science Fiction, Fantasy & Horror Films.  The Saturn Awards, which are the oldest film-specialized awards to reward genre fiction achievements, in particular for science fiction, fantasy, and horror (the Hugo Award for Best Dramatic Presentation is the oldest award for science fiction and fantasy films), included the Best Director category for the first time at the 3rd Saturn Awards, for the 1974/1975 film years.

Saturn II: The Saturn II was a series of American expendable launch vehicles, studied by North American Aviation under NASA contract in 1966, derived from the Saturn V rocket used for the Apollo lunar program.  The intent of the study was to eliminate production of the Saturn IB, and create a lower-cost heavy launch vehicle based on Saturn V hardware.  North American studied three versions with the S-IC first stage removed: the INT-17, a two-stage vehicle with a low Earth orbit payload capability of 47,000 lb ; the INT-18, which added Titan UA1204 or UA1207 strap-on solid rocket boosters, with payloads ranging from 47000 lb to 146400 lb ; and the INT-19, using solid boosters derived from the Minuteman missile first stage.

Saturn Award for Best Editing: The Saturn Award for Best Editing (originally Saturn Award for Outstanding Editing) is one of the annual awards given by the American Academy of Science Fiction, Fantasy and Horror Films.  The Saturn Awards, which are the oldest film-specialized awards to reward science fiction, fantasy, and horror achievements (the Hugo Award for Best Dramatic Presentation is the oldest award for science fiction and fantasy films), included the category for the first time at the 5th Saturn Awards, for the 1977 film year.

Bangkok Dangerous (2008 film): Bangkok Dangerous is a 2008 crime thriller film written and directed by the Pang Brothers, and starring Nicolas Cage.  It is a remake of the Pangs' 1999 debut "Bangkok Dangerous", a Thai film, for which Cage's production company, Saturn Films, purchased the remake rights.

Sonny (film): Sonny is a 2002 American crime-drama film starring James Franco, Harry Dean Stanton, Brenda Blethyn, Mena Suvari and Josie Davis.  Based on a screenplay by John Carlen, the film marked the directorial debut of Nicolas Cage, who makes a cameo appearance.  It was co-produced by Cage's production company Saturn Films.

Supporting paragraphs: David Diamond (screenwriter) The Family Man
Answer: David Diamond