Question: What profession does Lewis Milestone and All Quiet on the Western Front have in common?

Context paragraphs:
Fine Manners: Fine Manners is a 1926 American black-and-white silent comedy film directed initially by Lewis Milestone and completed by Richard Rosson for Famous Players-Lasky/Paramount Pictures.  After an argument with actress Gloria Swanson, director Milestone walked off the project, causing the film to be completed by Rosson, who had picked up directorial tricks while working as an assistant director to Allan Dwan.  The success of the film, being Rosson's first directorial effort since he co-directed "Her Father's Keeper" in 1917 with his brother Arthur Rosson, won him a long-term contract with Famous Players-Lasky.

Not So Quiet on the Western Front (film): Not So Quiet on the Western Front is a 1930 British comedy film directed by Monty Banks and starring Leslie Fuller, Mona Goya and Wilfred Temple.  It was made by British International Pictures.  Its title is a reference to "All Quiet on the Western Front".

The Front Page (1931 film): The Front Page is a 1931 American pre-Code comedy film, directed by Lewis Milestone and starring Adolphe Menjou and Pat O'Brien.  Based on a Broadway play of the same name, the film was produced by Howard Hughes, written by Bartlett Cormack and Charles Lederer, and distributed by United Artists.  The supporting cast includes Mary Brian, George E. Stone, Matt Moore, Edward Everett Horton and Walter Catlett.  At the 4th Academy Awards, the film was nominated for Best Picture, Milestone for Best Director, and Menjou for Best Actor.

No Minor Vices: No Minor Vices is a 1948 American black-and-white comedy film written by Arnold Manoff and directed by Lewis Milestone with Robert Aldrich as 1st assistant director.  Created for David Loew's Enterprise Productions, it was the first of three films distributed by Metro-Goldwyn-Mayer after parting ways with United Artists, and was the last of four films made by Dana Andrews for director Milestone.

Kangaroo (1952 film): Kangaroo is a 1952 American Technicolor film directed by Lewis Milestone.  It is also known as The Australian Story (American subtitle).  The first Technicolor movie filmed on-location in Australia.  Strong winds on location forced Milestone to re-dub much of the exterior dialogue.

The Widow (1955 film): The Widow (U.S. title) is a 1955 Italian black-and-white romantic drama film directed by Lewis Milestone and written by Milestone and Louis Stevens, based upon the novel "La Vedova" by Susan York.  Produced and originally released under the title La Vedova X, the film had theatrical release in Italy in 1955, limited release in the United States in 1957, and was released in France on June 4, 1959 under the title "La Veuve".  This was the last Milestone film involving his own writing.

Our Russian Front: Our Russian Front is a 1942 American documentary film directed by Joris Ivens and Lewis Milestone, and narrated by Walter Huston to promote support for the Soviet Union's war effort.

Lewis Milestone: Lewis Milestone (born Leib Milstein; September 30, 1895 – September 25, 1980) was a Moldovan-born American motion picture director.  He is known for directing "Two Arabian Knights" (1927) and "All Quiet on the Western Front" (1930), both of which received Academy Awards for Best Director.  He also directed "The Front Page" (1931 – nomination), "The General Died at Dawn" (1936), "Of Mice and Men" (1939), "Ocean's 11" (1960), and received the directing credit for "Mutiny on the Bounty" (1962), though Marlon Brando largely appropriated his responsibilities during its production.

All Quiet on the Western Front (1930 film): All Quiet on the Western Front is a 1930 American epic Pre-Code war film based on the Erich Maria Remarque novel of the same name.  It was directed by Lewis Milestone, and stars Louis Wolheim, Lew Ayres, John Wray, Arnold Lucy and Ben Alexander.

Seven Sinners (1925 film): Seven Sinners is a 1925 black-and-white silent crime comedy film directed by Lewis Milestone and written by Milestone and Darryl F. Zanuck.  The film was produced by Warner Bros.  Pictures.

Supporting paragraphs: Lewis Milestone All Quiet on the Western Front (1930 film)
Answer: director