Question: Are both Bernardo Bertolucci and George Tzavellas film directors?

Context articles: Attilio Bertolucci
Tragedy of a Ridiculous Man
Stealing Beauty
Gabriella Cristiani
The Drunkard (1950 film)
The Conformist (film)
George Tzavellas
Marinos Kontaras
Bernardo Bertolucci
Great Directors

Attilio Bertolucci (18 November 1911 – 14 June 2000) was an Italian poet and writer.
 He is father to film directors Bernardo and Giuseppe Bertolucci.
Tragedy of a Ridiculous Man (Italian: La tragedia di un uomo ridicolo ) is a 1981 Italian film directed by Bernardo Bertolucci.
 It stars Anouk Aimée and Ugo Tognazzi, who was awarded the Best Male Actor Award at the 1981 Cannes Film Festival for his performance.
 In his review, Vincent Canby describes the film as, "Bernardo Bertolucci's very good, cerebrally tantalizing new film, "Tragedy of a Ridiculous Man," the story of what may or may not be a terrorist kidnapping of the sort that has been making Italian headlines with increasing frequency in recent years."
Stealing Beauty (French: "Beauté volée" ; Italian: "Io ballo da sola" ) is a 1996 drama film directed by Bernardo Bertolucci and starring Liv Tyler, Joseph Fiennes, Jeremy Irons, Sinéad Cusack, and Rachel Weisz.
 Written by Bertolucci and Susan Minot, the film is about an American teenage girl who travels to a lush Tuscan villa near Siena to stay with family friends of her poet mother, who recently died.
 The film was an international co-production between France, Italy, the United Kingdom, and the United States, and was actress Liv Tyler's first leading film role.
Gabriella Cristiani (born 1949) is an Italian film editor with about twenty feature film credits.
 She has had a notable collaboration with director Bernardo Bertolucci.
 Early in her career she assisted editor Franco Arcalli on two of Bertolucci's films, "Last Tango in Paris" (1972) and "1900" (1976).
 Arcalli was the "supervising editor" on a 1977 film, "Berlinguer, I Love You", that was one of Cristiani's first feature editing credits; the film was directed by Giuseppe Bertolucci - Bernardo's brother.
 Arcalli was to have edited Bernardo Bertolucci's next film, "La Luna" (1979), but he died during production; Cristiani, who was assisting, then took over as editor.
The Drunkard (Greek: Ο μεθύστακας ), is a 1950 Greek drama film written and directed by George Tzavellas.
 It was the highest grossing Greek film in 1950, selling 304,438 tickets.
The Conformist (Italian: "Il conformista" ) is a 1970 political drama film directed by Bernardo Bertolucci.
 The screenplay was written by Bertolucci based on the 1951 novel "The Conformist" by Alberto Moravia.
 The film stars Jean-Louis Trintignant and Stefania Sandrelli, and features Gastone Moschin, Enzo Tarascio, Fosco Giachetti, José Quaglio, Dominique Sanda and Pierre Clémenti.
 The film was a co-production of Italian, French, and West German film companies.
George Tzavellas, also rendered Giorgos Tzavellas, Yiorgos Tzavellas, or Yorgos Javellas (Greek: Γιώργος Τζαβέλλας , 1916, Athens – October 18, 1976), was a Greek film director, screenwriter, and playwright.
 His filmmaking was particularly influential, with critic Georges Sadoul considering him "one of the three major postwar Greek directors" (along with Michael Cacoyannis and Nikos Koundouros).
Marinos Kontaras (Greek: Μαρίνος Κοντάρας ), also known as "The Corsair of the Aegean", is a 1948 Greek film written and directed by George Tzavellas, adapted from a short story of Argyris Eftaliotis.
 It was the first Greek film to be selected in an international festival (Experimental Film festival of Knokke-Heist).
Bernardo Bertolucci (] ; born 16 March 1940) is an Italian director and screenwriter, whose films include "The Conformist", "Last Tango in Paris", "1900", "The Last Emperor", "The Sheltering Sky", "Stealing Beauty" and "The Dreamers".
 In recognition of his work, he was presented with the inaugural Honorary Palme d'Or Award at the opening ceremony of the 2011 Cannes Film Festival.
 Since 1979, he has been married to screenwriter Clare Peploe.
Great Directors is a 2009 documentary film written and directed by Angela Ismailos.
 In the film, Ismailos interviews directors of the late 20th and early 21st centuries, including Bernardo Bertolucci, Catherine Breillat, Liliana Cavani, Stephen Frears, Todd Haynes, Richard Linklater, Ken Loach, David Lynch, John Sayles, and Agnes Varda.