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.
The Romance of Elaine is a 1915 American silent adventure film serial directed by George B. Seitz, Leopold Wharton and Theodore Wharton, based on the novel by Arthur B. Reeve.
 The film is considered to be lost.
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 Eagle's Eye is a 1918 American serial film consisting of 20 episodes that dramatizes German espionage in the United States during World War I.
 It features King Baggot in the lead role as the daring espionage agent.
 Among the events depicted are the sending of the Zimmermann Telegram, Franz von Rintelen's attempts to sabotage cargo loading in San Francisco Harbor, and the capture of the German espionage plans.
 It was directed by George Lessey, Wellington A. Playter, Leopold Wharton, and Theodore Wharton, and produced by the Whartons Studio.
 The serial is now considered lost.
 Because this serial was a commercial failure, it was the last one made by Whartons due to the studio being forced to declare bankruptcy.
The Whartons, Inc. was an early silent film production company operating in Ithaca, New York from 1914 to 1919.
 The Ithaca Studio was established by brothers Theodore and Leopold Wharton on the shores of Cayuga Lake, at the site of what is now Stewart Park.
 Currently, efforts are underway to create a silent movie museum in the former Wharton movie studio building in Stewart Park.
Alan Crosland (August 10, 1894 – July 16, 1936) was an American stage actor and film director.
The New Exploits of Elaine is a 1915 American action film serial directed by Louis J. Gasnier, Leopold Wharton and Theodore Wharton.
 It is presumed to be lost.
Leopold Wharton (September 1, 1870 – September 27, 1927) was an American film director, producer and writer.
 He directed 37 films between 1911 and 1922, including the 1915 film "The New Adventures of J. Rufus Wallingford", which featured Oliver Hardy.
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.
Beatrice Fairfax is an American silent film serial directed and produced by Leopold Wharton and Theodore Wharton.
 First released on August 7, 1916, the series consists of 15 weekly episodes and features the character of "Beatrice Fairfax" (Grace Darling).
 The character was inspired by the popular newspaper advice column "Ask Beatrice Fairfax", which had been the world's first column of its kind when launched in 1898.

Question: What do Alan Crosland and Leopold Wharton have in common?
Answer: film director