Question: Who has also been an editor, William A. Seiter or Mitch Anderson?

Context paragraphs:
Love Birds (1934 film): Love Birds is a 1934 American Pre-Code comedy film directed by William A. Seiter and written by Doris Anderson, Henry Myers and Tom Reed.  The film stars Slim Summerville, ZaSu Pitts, Mickey Rooney, Frederick Burton, Emmett Vogan, and Dorothy Christy.  The film was released on May 4, 1934, by Universal Pictures.

Mitch Anderson (director): Mitch Anderson is a Romanian-born American film director, producer, writer, researcher and editor.  He is the only son of former political dissidents of the Stalinist era.  His first film, "The World Without US", explores what might happen if the United States were to leave the international arena, rescind its global reach and return to being a non-interventionist nation.

The Men Who Lost China: The Men Who Lost China is a documentary film created by Mitch Anderson.  Released in 2013, the documentary explores the United States' attitude towards China following the 1911 Chinese Revolution and the First World War and how the attitude of other Western nations then helped shape China's national identity, particularly its foreign policy and alignment with the former Soviet Union.

Passing Through (film): Passing Through (also known as Passing Thru) is a 1921 American silent comedy film directed by William A. Seiter and written by Agnes Christine Johnston, and Joseph F. Poland.  The film stars Douglas MacLean, Madge Bellamy, Otto Hoffman, Cameron Coffey, Fred Gamble, Bert Hadley, and Margaret Livingston.  The film was released on August 14, 1921, by Paramount Pictures.  It is not known whether the film currently survives, which suggests that it is a lost film.

The World Without US: The World Without US is a documentary film created by Mitch Anderson and Jason J. Tomaric.  Released in 2008, the documentary explores what might happen if the United States were to leave the international arena, rescind its global reach and become an isolationist nation for the first time since the early 20th century.

China's Century of Humiliation: China's Century of Humiliation is a documentary film created by Mitch Anderson.  Released in 2011, it explores the tumultuous interaction between China and the European powers throughout the 19th century.

Frances Anderson: Frances E. Anderson is considered one of the pioneers of art therapy.  She is an honorary lifetime member of the American Art Therapy Association (AATA).  Anderson is a researcher, a distinguished professor, an author, and the first art therapist to receive a Fulbright Senior Scholar Award.  She has also served as the editor of "Art Therapy, Journal of the American Art Therapy Association", and as a member of the AATA Education and Program Approval Board.  She has written nearly 80 papers and made 130 presentations regarding her work.  Anderson has worked with several populations including children with disabilities and adult survivors of incest.  She has also worked extensively overseas through an organization entitled Communities Healing through Art, or CHART, which serves areas affected by natural and other disasters.

The X-Files (film): The X-Files (also known as The X-Files: Fight the Future) is a 1998 American science fiction thriller film directed by Rob Bowman.  Chris Carter wrote the screenplay.  The story is by Carter and Frank Spotnitz.  It is the first feature film based on Carter's television series "The X-Files, " which revolves around fictional unsolved cases called the X-Files and the characters solving them.  Five main characters from the television series appear in the film: David Duchovny, Gillian Anderson, Mitch Pileggi, John Neville, and William B. Davis reprise their respective roles as FBI agents Fox Mulder and Dana Scully, FBI Assistant Director Walter Skinner, Well-Manicured Man, and the Cigarette-Smoking Man.  The film was promoted with the tagline "Fight the Future".

William A. Seiter: William A. Seiter (June 10, 1890 – July 26, 1964) was an American film director.

Arthur Roberts (editor): Arthur Roberts July 17, 1890 – February 5, 1961), also known as Arthur E. Roberts, was an American film editor who edited over 100 films during his almost 30 year career.  He began ending towards the end of the silent era of the film industry, his first film being 1927's "The College Hero", directed by Walter Lang.  His last film was Republic's "Lay That Rifle Down" in 1955, after which he spent a brief period as the editor for the television series, "Lassie", before retiring in 1956.  During his career he would work with many famous directors, including Frank Capra (on several films, including "The Donovan Affair"), Lowell Sherman (on "The Royal Bed"), William Seiter (on several films, including "Way Back Home"), Edward Cline (on "Cracked Nuts"), George Cukor ("A Bill of Divorcement"), Dorothy Arzner (the first female member of the DGA, on "Christopher Strong"), Anthony Mann ("Strangers in the Night"), George Archainbaud ("Girls of the Big House"), Fritz Lang ("House by the River"),

Supporting paragraphs: William A. Seiter Mitch Anderson (director)
Answer: Mitch Anderson