Question: Lewis Milestone and Aaron Katz, are both of which nationality?

Context articles: No Minor Vices
Lewis Milestone
The Widow (1955 film)
Aaron Katz (filmmaker)
Kangaroo (1952 film)
Fine Manners
The Front Page (1931 film)
Seven Sinners (1925 film)
The North Star (1943 film)
Cold Weather

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.
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.
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.
Aaron Katz (born October 29, 1981) is an award-winning independent American filmmaker from Portland, Oregon.
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.
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.
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.
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.
The North Star (also known as Armored Attack in the US) is a 1943 war film produced by Samuel Goldwyn Productions and distributed by RKO Radio Pictures.
 It was directed by Lewis Milestone, written by Lillian Hellman and featured production design by William Cameron Menzies.
 The film starred Anne Baxter, Dana Andrews, Walter Huston, Walter Brennan and Erich von Stroheim.
 The music was written by Aaron Copland, the lyrics by Ira Gershwin, and the cinematography was by James Wong Howe.
 The film also marked the debut of Farley Granger.
Cold Weather is an American mystery film written by Aaron Katz, Ben Stambler, and Brendan McFadden and directed by Katz with Stambler and McFadden producing.
 The film stars Cris Lankenau as a former forensic science student investigating the mysterious disappearance of his ex-girlfriend.
 The film was shot and set in Portland, Oregon, which was also the setting of Katz's debut feature, "Dance Party USA".