Question: Are Robert Altman and Djibril Diop Mambéty both film directors?

Context articles: Djibril Diop Mambéty
Touki Bouki
La Petite Vendeuse de Soleil
Hyènes
Wasis Diop
Mambéty for Ever
Le Franc
Badou Boy
Laboratoire Agit'Art
Robert Altman

Djibril Diop Mambéty (January 1945 – July 23, 1998) was a Senegalese film director, actor, orator, composer and poet.
 Though he made only a small number of films, they received international acclaim for their original and experimental cinematic technique and non-linear, unconventional narrative style.
 Born to a Muslim family near Dakar, Senegal's capital city, Mambéty was Wolof.
 He died in 1998 while being treated for lung cancer in a Paris hospital.
Touki Bouki (] , Wolof for The Journey of the Hyena) is a 1973 Senegalese drama film, directed by Djibril Diop Mambéty.
 It was shown at the 1973 Cannes Film Festival and the 8th Moscow International Film Festival.
La Petite Vendeuse de Soleil (or The Little Girl Who Sold the Sun) is a 1999 Senegalese short drama film, directed by Djibril Diop Mambéty which premiered posthumously after his death in 1998.
Hyènes is a 1992 Senegalese comedy film adaptation of Friedrich Dürrenmatt's Swiss-German satirical play "The Visit", directed by Djibril Diop Mambéty.
 The intimate story of love and revenge parallels a critique of neocolonialism and African consumerism.
 It was entered into the 1992 Cannes Film Festival.
Wasis Diop (born 1950 in Dakar, Senegal) is a Senegalese musician of international renown, known for blending traditional Senegalese folk music with modern pop and jazz.
 The son of a Senegalese high official and member of the Lebou ethnic group, Diop left Senegal in the 1970s to study engineering in Paris, but once there turned to music, joining a fellow Senegalese musician, Umban Ukset, in forming the band West African Cosmos.
 Diop left the band in 1979 to start a solo career, and over the next decade achieved some small success, particularly in partnerships with singer Marie-France Anglade of Black Heritage, and jazz saxophonist Yasuaki Shimizu.
 It was not until the early 1990s that his career began to take off, with the success of his first album, the soundtrack to the film "Hyenes" (which had been directed by his brother, Djibril Diop Mambety).
 "Variety" described his soundtrack to 2006's "Daratt" from Chad as "outstanding".
 His mother was Binta Diop.
A film made in Cameroon and France about the life and work of filmmaker Djibril Diop Mambéty, with testimonials from filmmakers Abderrahmane Sissako, Newton Aduaka and Mahamat-Saleh Haroun, Cheick Fantamady Camara, Mahama Johnson Traoré; critics Catherine Ruelle, Thierno I. Dia and Brice Ahounou; Cameroonian actor Gérard Essomba; Mambéty's brother, Wasis Diop; and his son, Teemour Diop.
Le Franc is a 1994 Senegalese short comedy film, directed by Djibril Diop Mambéty.
Badou Boy is a 1970 Senegalese short film, directed by Djibril Diop Mambéty.
Laboratoire Agit'Art was an art collective founded in Dakar, Senegal in 1973 by writer and performer Youssouf John with goal of revitalising artistic production and critique institutional frameworks and the philosophy of Negritude in particular.
 John soon left for Martinique and the group/workshop was handed on to Issa Samb.
 Other key members included (El Sy), , Djibril Diop Mambéty, and Youssoupha Dione.
Robert Bernard Altman ( ; February 20, 1925 – November 20, 2006) was an American film director, screenwriter, and film producer.
 A five-time nominee of the Academy Award for Best Director and an enduring figure from the New Hollywood era, Altman was considered a "maverick" in making films with a highly naturalistic but stylized and satirical aesthetic, unlike most Hollywood films.
 He is consistently ranked as one of the greatest and most influential filmmakers in American cinema.