Question: Do filmm directors Joseph L. Mankiewicz and Berthold Viertel share the same nationality?

Context paragraphs:
Joseph L. Mankiewicz: Joseph Leo Mankiewicz (February 11, 1909 – February 5, 1993) was an American film director, screenwriter, and producer.  Mankiewicz had a long Hollywood career, and he twice won the Academy Award for both Best Director and Best Writing, Screenplay for "A Letter to Three Wives" (1949) and "All About Eve" (1950).

The Wiser Sex: The Wiser Sex is a 1932 American Pre-Code crime drama film made by Paramount Pictures, directed by Berthold Viertel and Victor Viertel, and starring Claudette Colbert, Melvyn Douglas, Lilyan Tashman, William "Stage" Boyd and Ross Alexander.

Little Friend (film): Little Friend is a 1934 British drama film directed by Berthold Viertel and starring Matheson Lang, Nova Pilbeam and Lydia Sherwood.  The film was based on a novel by Ernst Lothar and adapted for the screen by Margaret Kennedy and Christopher Isherwood.

Francis Mankiewicz: Francis Mankiewicz (March 15, 1944 in Shanghai, China – August 14, 1993 in Montreal, Quebec, Canada) was a Canadian film director, screenwriter and producer.  In 1945, his family moved to Montreal, where Francis spent all his childhood.  His father was a second cousin to the famous Hollywood brothers, Joseph L. Mankiewicz and Herman J. Mankiewicz.

Nora (1923 film): Nora is a 1923 German silent drama film directed by Berthold Viertel and starring Olga Tschechowa, Carl Ebert and Fritz Kortner.  It is an adaptation of the 1879 play "A Doll's House" by Henrik Ibsen.  It premiered in Berlin on 2 February 1923.  The film's art direction was by Walter Reimann.

Berthold Viertel: Berthold Viertel (28 June 1885 - 24 September 1953) was an Austrian screenwriter and film director notable for his work in Germany, Britain and the United States.

The Magnificent Lie: The Magnificent Lie is a 1931 American drama film directed by Berthold Viertel and written by Vincent Lawrence, Leonard Merrick and Samson Raphaelson.  The film stars Ruth Chatterton, Ralph Bellamy, Stuart Erwin, Françoise Rosay, Sam Hardy, Charles Boyer and Tyler Brooke.  The film was released on July 25, 1931, by Paramount Pictures.

Salka and Berthold Viertel House: The Salka and Berthold Viertel House at 165 North Mabery Road in Santa Monica, California, was the home of the Austrian screenwriter Salka Viertel and her husband Bertold from 1933 to 1944.

The Man from Yesterday: The Man from Yesterday is a 1932 American pre-Code romantic war drama film made by Paramount Pictures, directed by Berthold Viertel, and written by Oliver H. P. Garrett, based on a story by Neil Blackwell and Rowland G. Edwards.

Rhodes of Africa: Rhodes of Africa is a 1936 British biographical film charting the life of Cecil Rhodes.  It was directed by Berthold Viertel and starred Walter Huston, Oskar Homolka, Basil Sydney and Bernard Lee.

Supporting paragraphs: Joseph L. Mankiewicz Berthold Viertel
Answer: no