Alan Crosland (August 10, 1894 – July 16, 1936) was an American stage actor and film director.
Week Ends Only is a 1932 American Pre-Code film made by Fox Film Corporation, directed by Alan Crosland, and starring by Joan Bennett, Ben Lyon and John Halliday.
 The screenplay was written by William M. Conselman and Samuel Hopkins Adams, based on novel by Samuel Hopkins Adams.
General Crack is a 1930 American Pre-Code part-talkie historical costume melodrama with Technicolor sequences which was directed by Alan Crosland and produced and distributed by Warner Bros. It was filmed and premiered in 1929, and released early in 1930.
 It stars John Barrymore in his first full-length all-talking feature.
 The film would prove to be Crosland and Barrymore's last historical epic together.
William Wyler (born as Willy Wyler; July 1, 1902 – July 27, 1981) was an American film director, producer and screenwriter.
 Notable works include "Ben-Hur" (1959), "The Best Years of Our Lives" (1946), and "Mrs. Miniver" (1942), all of which won Academy Awards for Best Director, as well as Best Picture in their respective years, making him the only director of three Best Picture winners as of 2017.
 Wyler received his first Oscar nomination for directing "Dodsworth" in 1936, starring Walter Huston, Ruth Chatterton and Mary Astor, "sparking a 20-year run of almost unbroken greatness."
Lady Tubbs is a 1935 American comedy film directed by Alan Crosland and written by Barry Trivers.
 The film stars Alice Brady, Douglass Montgomery, Anita Louise, Alan Mowbray, June Clayworth and Hedda Hopper.
 The film was released on July 2, 1935, by Universal Pictures.
The Case of the Howling Dog is a 1934 American mystery film directed by Alan Crosland, based on the novel of the same name by Erle Stanley Gardner.
 The film stars Warren William and Mary Astor.
 This was the first in a series of four films in which William played Perry Mason.
Contraband is a lost 1925 silent film produced by Famous Players-Lasky and distributed by Paramount Pictures.
 Alan Crosland directed and Lois Wilson stars.
 The film is taken from a novel, "Contraband", by Charles Buddington Kelland.
 The last film directed by Alan Crosland the cooperation with distributor Paramount Pictures.
The Committee for the First Amendment was an action group formed in September 1947 by actors in support of the Hollywood Ten during the hearings of the House Un-American Activities Committee (HUAC).
 It was founded by screenwriter Philip Dunne, actress Myrna Loy, and film directors John Huston and William Wyler.
Under the Red Robe is a 1937 British / American film directed by Victor Sjöström.
 Previously filmed as a 1923 silent directed by Alan Crosland.
 Before the films a play had been produced on Broadway in 1896-97 starring Viola Allen and William Faversham.
Enemies of Women is a 1923 silent romantic drama film directed by Alan Crosland and starring Lionel Barrymore, Alma Rubens, Gladys Hulette, Pedro de Cordoba, and Paul Panzer.
 The film was produced by William Randolph Hearst through his Cosmopolitan Productions.
 Pre-fame actresses Clara Bow and Margaret Dumont have uncredited bit roles.

Question: Were both William Wyler and Alan Crosland American film directors?
Answer: yes