Question: Are Steven Spielberg and W. D. Richter both American director, produce and screenwriter?

Context articles: Duel (1971 film)
Steven Spielberg
Influence of Stanley Kubrick
Kenneth Wannberg
Steven Spielberg's unrealized projects
Rick Carter
W. D. Richter
Pinky, Elmyra &amp; the Brain
Frank Marshall (producer)
Matt Charman

Duel is a 1971 television (and later full-length theatrical) thriller film written by Richard Matheson, which is based on his own short story.
 The film is the full-length film directing debut of American director, producer, and screenwriter Steven Spielberg.
Steven Allan Spielberg, {'1': ", '2': ", '3': 'KBE', '4': "} , {'1': ", '2': ", '3': 'OMRI', '4': "} (born December 18, 1946) is an American director, producer, and screenwriter.
 He is considered one of the founding pioneers of the New Hollywood era, as well as being viewed as one of the most popular directors and producers in film history.
 He is also one of the co-founders of DreamWorks Studios.
Stanley Kubrick is regarded by film critics and historians as one of the most influential directors of all time.
 Leading directors, including Martin Scorsese, Steven Spielberg, George Lucas, James Cameron, Woody Allen, Terry Gilliam, the Coen Brothers, Ridley Scott, Paul Thomas Anderson, Christopher Nolan, David Lynch, and George A. Romero, have cited Kubrick as a source of inspiration, and in the case of Spielberg, collaboration.
 In an interview for the "Eyes Wide Shut" DVD release, Steven Spielberg comments that "nobody could shoot a picture better in history", and that Kubrick told stories in a way "antithetical to the way we are accustomed to receiving stories".
 Writing in the introduction to a recent edition of Michel Ciment's "Kubrick", film director Martin Scorsese notes most of Kubrick's films were misunderstood and under-appreciated when first released, only to be considered masterpieces later on.
Kenneth Gail Wannberg (born June 28, 1930, in Los Angeles, California) is an American composer and sound editor.
 He has worked extensively with the composer John Williams on some of the biggest box office films of all time.
 His music editing credits include "Star Wars" (George Lucas, 1977), "Raiders of the Lost Ark" (Steven Spielberg, 1981), "JFK" (Oliver Stone, 1991), "Schindler’s List" (Spielberg, 1993), and "Harry Potter and the Prisoner of Azkaban" (Alfonso Cuarón, 2004).
 In 1986 Wannberg won an Emmy for his sound editing on Steven Spielberg’s Amazing Stories series.
The following is a list of unproduced Steven Spielberg projects in roughly chronological order.
 During his long career, American film director Steven Spielberg has worked on a number of projects which never progressed beyond the pre-production stage under his direction.
 Some of these projects fell in development hell, were officially canceled, or were in development limbo.
Rick Carter (born 1950) is an American production designer and art director.
 He is known for his work in the film "Forrest Gump", which earned him an Oscar nomination, as well as numerous nominations of other awards for his work in "Amistad" and "A.I. Artificial Intelligence".
 Other films include "Cast Away", "War of the Worlds", "What Lies Beneath", "Jurassic Park", "Avatar", and "Back to the Future Part II" and "Part III".
 Many of the films that he has worked on are directed by Steven Spielberg or Robert Zemeckis.
 For his part in the Art Direction of "Avatar", he was awarded the Academy Award for Best Production Design alongside Robert Stromberg and Kim Sinclair.
 In 2013, Carter won his second Academy Award, for production design on Steven Spielberg's biopic, "Lincoln".
W. D. Richter (born December 7, 1945, New Britain, Connecticut) is a screenwriter and film director and producer.
 He is best known for adapting "Invasion of the Body Snatchers", directing "The Adventures of Buckaroo Banzai Across the 8th Dimension" and co-writing "Big Trouble in Little China".
Steven Spielberg Presents Pinky, Elmyra & the Brain is the retooling of the animated television series "Pinky and the Brain" (itself being a spin-off from "Animaniacs"), with the title characters being joined by Elmyra Duff from "Tiny Toon Adventures".
 The show is executive produced by Steven Spielberg and the series was produced by Amblin Television in association with Warner Bros.
 Animation, and aired from 1998 to 1999 on The WB Television Network, running for 13 episodes.
 It was Spielberg's last collaborative effort with Warner Bros.
 Animation.
Frank Wilton Marshall (born September 13, 1946) is an American film producer and director, often working in collaboration with his wife, Kathleen Kennedy.
 With Kennedy and Steven Spielberg, he was one of the founders of Amblin Entertainment.
 In 1991, he founded, with Kennedy, The Kennedy/Marshall Company, a film production company which has a contract with DreamWorks.
 Since May 2012, with Kennedy taking on the role of President of Lucasfilm, Marshall has been Kennedy/Marshall's sole principal.
 Marshall has consistently collaborated with directors Steven Spielberg, Paul Greengrass and Peter Bogdanovich.
Matt Charman is a British screenwriter, playwright, and producer.
 He was nominated for an Academy Award for best original screenplay for his 2015 film "Bridge of Spies", directed by Steven Spielberg and co-written with Joel and Ethan Coen.
 Charman started out writing for theatre, making his breakthrough as writer-in-residence at London’s National Theatre, where then director Nicholas Hytner described Charman as having "a priceless nose for a story."
 He recently wrote the pilot episode of "Oasis", a sci-fi drama for Amazon Video adapting Michel Faber's "The Book of Strange New Things", and is working on a second movie for Steven Spielberg's Amblin Partners, based on Walter Cronkite’s 1968 visit to Vietnam.