Question: Are Robert Gregson and Mauritz Stiller both American film directors?

Context paragraphs:
Julius Jaenzon: Julius Jaenzon (8 July 1885 – 17 February 1961) was a Swedish cinematographer, essential in the early Swedish silent cinema.  He is most known for his collaborations with directors Victor Sjöström and Mauritz Stiller, particularly in adaptions of novels by Selma Lagerlöf.  Especially the accuracy with which he mastered the double exposure, for example in "The Phantom Carriage", was much admired at the time.

Richard Lund: Richard Lund (9 July 1885 – 27 September 1960) was a Swedish film and theatre actor.  He made his stage debut at Stora Teatern in Gothenburg in 1904 and later appeared in 73 films between 1912 and 1952, making his most important roles during the silent film era.  Among his best-known roles is that of Sir Archie in Mauritz Stiller's "Sir Arne's Treasure" (1919).  He was the most prominent "first lover" of Swedish film during his heyday.

Hotel Imperial (1927 film): Hotel Imperial is a 1927 American silent film directed by Mauritz Stiller, set in World War I and starring Pola Negri as a hotel chambermaid.  It is based on the 1917 Hungarian play of the same name by Lajos Bíró.

Paul Seelig: Paul Seelig (5 October 1900 – June 1931) was a Swedish actor.  He appeared in about 15 roles in films 1913 and 1931.  His film debut was in Mauritz Stiller's film "En pojke i livets strid" in 1913, when he was thirteen years old.

Mauritz Stiller: Mauritz Stiller (17 July 1883 – 18 November 1928) was a Finnish-Swedish film director, best known for discovering Greta Garbo and bringing her to America.

The Wings (film): The Wings (Swedish: Vingarne ) is a 1916 Swedish silent film directed by Mauritz Stiller, starring Egil Eide, Lars Hanson, Lili Bech, and Julius Hälsig, and was based on Herman Bang's 1902 novel "Mikaël", which was the same source Carl Theodor Dreyer used for his 1924 film "Michael".

The Saga of Gosta Berling: The Saga of Gosta Berling (Swedish: Gösta Berlings saga ) is a 1924 Swedish romantic drama film directed by Mauritz Stiller and released by AB Svensk Filmindustri, starring Lars Hanson, Gerda Lundequist and Greta Garbo in her native break-out role on film.  The film is based on the 1891 debut novel of the same name by the Swedish author and Nobel Prize winner Selma Lagerlöf.  It is also known as Gosta Berling's Saga, The Story of Gosta Berling and The Atonement of Gosta Berling.

The Blizzard (1923 film): The Blizzard is a 1923 Swedish drama film directed by Mauritz Stiller, starring Einar Hanson, Mary Johnson, Pauline Brunius and Hugo Björne.  The film's original Swedish title is Gunnar Hedes saga, which means "The story of Gunnar Hede".  The narrative revolves a student who tries to save his family's mansion which is facing bankruptcy.  The film is loosely based on the Selma Lagerlöf novel "The Tale of a Manor".

Bengt Djurberg: Bengt Djurberg (23 July 1898 – 2 November 1941) was a Swedish actor and singer.  He appeared in about 25 roles in films 1919 and 1940.  His film debut was in Mauritz Stiller's film "Sången om den eldröda blomman" in 1919.

Robert Gregson: Robert Gregson is an American filmmaker.  During the reconstruction of the Ed Sullivan Theater for the new Late Show with Stephen Colbert, Gregson directed "Envisioning a New Home for The Late Show", a viral mini-doc about the renovation.  Gregson's short film "The Refrigerator" won the Best New Director Award at the 2015 Brooklyn Film Festival.  In 2015, Gregson and Local Empire Productions raised $35,635 on Kickstarter to produce the feature film "Trivia Night", a dark comedy about an underground pub quiz trivia legend in NYC.  Trivia Night earned the Best Feature Film Award at the 2016 Omaha Film Festival.

Supporting paragraphs: Robert Gregson Mauritz Stiller
Answer: no