Question: What profession did both Leni Riefenstahl and Abel Ferrara share?

Context articles: Sepp Allgeier
Leni Riefenstahl
Leni Riefenstahl: Her Dream of Africa
Biography: A Brief History
Abel Ferrara
The Holy Mountain (1926 film)
Charlotte Riefenstahl
Leni Riefenstahl's Memoiren
The Blue Light (1932 film)
The Wonderful Horrible Life of Leni Riefenstahl

Josef “Sepp” Allgeier (6 February 1895 – 11 March 1968) was a German cinematographer who worked on around fifty features, documentaries and short films.
 He began his career as a cameraman in 1911 for the Expreß Film Co. of Freiburg.
 In 1913 he filmed newsreels in the Balkans.
 He then became an assistant to Arnold Fanck, a leading director of Mountain films.
 He worked frequently with Luis Trenker and Leni Riefenstahl, both closely associated with the genre.
 He was Riefenstahl's lead cameraman on her 1935 propaganda film "Triumph of the Will".
 During the Second World War, Allgeier filmed material for newsreels.
 He later worked in West German television.
 His son is the cinematographer Hans-Jörg Allgeier.
Helene Bertha Amalie "Leni" Riefenstahl (] ; 22 August 1902 – 8 September 2003) was a German film director, producer, screenwriter, editor, photographer, actress and dancer.
Leni Riefenstahl: Her Dream of Africa ("Leni Riefenstahl: Ihr Traum von Afrika") is a 2000 documentary-film by Ray Müller.
 The film follows Leni Riefenstahl's return to Sudan to visit the Nuba tribe whom she published photographs of in best-sellers such as "The Last of the Nuba" and "The People of Kau".
 It is the second collaboration between Riefenstahl and Müller.
 She was the subject of his acclaimed 1993 documentary "The Wonderful, Horrible Life of Leni Riefenstahl", which followed her life and reflected on her Nuba activities.
Biography: A Brief History is a book by Nigel Hamilton that portrays, through historiography, the history of biography, and shows how biographers have portrayed and interpreted individuals' lives.
 The book examines the historical evolution of the biography from the ancient world to the present, from the Epic of Gilgamesh to the recent "American Splendor", from cuneiform to the Internet, from commemoration to deconstruction, and from fiction to fact.
 It also examines such famous biographical authors as Plutarch, Saint Augustine, Sir Walter Raleigh, Samuel Johnson, Jean-Jacques Rousseau, Lord Byron, Sigmund Freud, Lytton Strachey, Abel Gance, Virginia Woolf, Leni Riefenstahl, Orson Welles, Julian Barnes, Ted Hughes, and Frank McCourt.
Abel Ferrara (born July 19, 1951) is an American filmmaker, known for the provocative and often controversial content in his films, his use of neo-noir imagery and gritty urban settings.
 A long-time independent filmmaker, some of his best known films include "Ms. 45" (1981), "King of New York" (1990), "Bad Lieutenant" (1992) and "The Funeral" (1996).
The Holy Mountain (German: "Der heilige Berg" ) is a 1926 German mountain film directed by Arnold Fanck and starring Leni Riefenstahl, Luis Trenker and Frida Richard.
 It was the future filmmaker Riefenstahl's first screen appearance as an actress.
 Written by Arnold Fanck and Hans Schneeberger, the film is about a dancer who meets and falls in love with an engineer at his cottage in the mountains.
 After she gives her scarf to one of his friends, the infatuated friend mistakenly believes that she loves him.
 When the engineer sees her innocently comforting his friend, he mistakenly believes she is betraying him.
Charlotte Riefenstahl (24 May 1899 in Bielefeld, Germany – 6 January 1993 in Northfield, Minnesota, United States ) was a German physicist.
 She has no relation to Leni Riefenstahl, the notable German filmmaker.
Leni Riefenstahl's Memoiren is the 1987 autobiography of German film director, Leni Riefenstahl.
 The book received a 1993 American release and coincided with the release of the acclaimed documentary; "The Wonderful, Horrible Life of Leni Riefenstahl" as well as Riefenstahl's ninetieth birthday.
 It was featured on the 1993 "New York Times" list of notable books of the year.
The Blue Light (German: "Das blaue Licht") is a black-and-white 1932 film written and directed by Leni Riefenstahl and Béla Balázs, with uncredited scripting by Carl Mayer.
 In Riefenstahl's film version, the witch, Junta, played by Riefenstahl, is intended to be a sympathetic character.
 Filming took place in the Brenta Dolomites, in Ticino, Switzerland, and Sarntal, Italy.
The Wonderful, Horrible Life of Leni Riefenstahl (German: "Die Macht der Bilder: Leni Riefenstahl" ) is a 1993 German documentary film about the life of German film director Leni Riefenstahl, directed by Ray Müller.