Question: Are Marshall Neilan and Godfrey Reggio both directors?

Context articles: Everybody's Acting
Minnie (film)
The Eternal Three
Godfrey Reggio
Powaqqatsi
The Sporting Venus
The Silent Partner (1917 film)
Men and Women (1914 film)
Marshall Neilan
The Unpardonable Sin

Everybody's Acting is a lost 1926 American drama silent film directed by Marshall Neilan and written by Marshall Neilan, Benjamin Glazer and George Marion Jr..
 The film stars Betty Bronson, Ford Sterling, Louise Dresser, Lawrence Gray, Henry B. Walthall, Raymond Hitchcock and Stuart Holmes.
 The film was released on November 8, 1926, by Paramount Pictures.
Minnie is a 1922 American silent comedy film starring Leatrice Joy and co-directed by Marshall Neilan and Frank Urson.
 Neilan also wrote and produced the film which was released by Associated First National Pictures (later First National Pictures).
 It is not known whether the film currently survives, which suggests that it is a lost film.
The Eternal Three is a 1923 American silent film drama produced and distributed by Goldwyn Pictures.
 It was directed by both Marshall Neilan and Frank Urson.
 Hobart Bosworth, Claire Windsor and Bessie Love star.
 The film was made from a screen story by Neilan and is now a lost film, although a brief production scene of director Marshall Neilan with stars Raymond Griffith, Hobart Bosworth, and Claire Windsor appear in the restored film "Souls for Sale".
Godfrey Reggio (born March 29, 1940) is an American director of experimental documentary films.
Powaqqatsi ( ), or Powaqqatsi: Life in Transformation, is a 1988 American documentary film directed by Godfrey Reggio and the sequel to Reggio's experimental 1982 film, "Koyaanisqatsi".
 It is the second film in the Qatsi trilogy.
The Sporting Venus (1925) is a silent romance film directed by Marshall Neilan.
 The film was the second MGM release of Neilan, and starred his wife, actress Blanche Sweet, who allegedly sported the lowest waistline of 1925.
 This is the first of two feature films that paired Ronald Colman with Blanche Sweet, the second being "His Supreme Moment", which was released in May 1925.
 This film is listed as being extant (surviving) at silentera database.
The Silent Partner is a 1917 American silent drama film directed by Marshall Neilan from a screen story by Edmund Goulding and starred Blanche Sweet, who in a few years would marry Marshall Neilan.
 The film was remade in 1923, and also released by Paramount Pictures.
Men and Women is an extant short 1914 silent film produced by the Biograph Company and released by General Film Company.
 It is based on the 1890 play of the same name by David Belasco and Henry Churchill de Mille.
 It stars Lionel Barrymore, Blanche Sweet and Marshall Neilan.
 Sweet and Neilan would later marry in real life.
Marshall Ambrose "Mickey" Neilan (April 11, 1891 – October 27, 1958) was an American motion picture actor, screenwriter, film director, and producer.
The Unpardonable Sin is a 1919 American silent drama/propaganda film set during World War I.
 The film was produced by Harry Garson, directed by Marshall Neilan, and stars Neilan's wife Blanche Sweet whose portrays dual roles in the film.
 "The Unpardonable Sin" is based on the novel of the same name by Rupert Hughes.
 It is not known whether the film currently survives, suggesting that it is a lost film.