Are Chris Mandia and Rupert Julian both American producers?
no
Rupert Julian
Rupert Julian (25 January 1879 – 27 December 1943) was the first New Zealand cinema actor, director, writer and producer.
Chris Mandia
Chris Mandia is an American playwright, screenwriter, film director, and Iraq War veteran from San Pedro, California.
 He was an U.S. Marine infantryman and served two combat tours in Iraq, including the battle for Fallujah.
 Mandia has won numerous awards for his work and received a Jack Nicholson scholarship to attend the MFA program at the University of Southern California’s film school.
 In 2010, he received an Operation In Their Boots fellowship and “Get Some,” a film he authored, was a Cannes Film Festival selection.
 In 2012 he co-wrote the multimedia physical theatre piece, "Trajectories: Transformations" with Meron Langsner for Evet Arts.
 The piece was based on interviews with servicemen from the Iraq and Afghanistan wars and was performed in Boston and Chicago.
Bettina Loved a Soldier
Bettina Loved a Soldier is a 1916 American silent comedy film directed by Rupert Julian and starring Louise Lovely, George Berrell and Francelia Billington.
 Made by Universal Pictures, it is based on the 1882 French novel "The Abbot Constantine" by Ludovic Halévy. Merry-Go-Round (1923 film)
Merry-Go-Round is a 1923 American feature film directed by Erich von Stroheim and his replacement, Rupert Julian, starring Norman Kerry and Mary Philbin, and released by Universal Pictures.
 A copy of the film is held in a collection and it has been released on DVD. The Phantom of the Opera (1925 film)
The Phantom of the Opera is a 1925 American silent horror film adaptation of Gaston Leroux's 1910 novel "Le Fantôme de l'Opéra", directed by Rupert Julian and starring Lon Chaney, Sr. in the title role of the deformed Phantom who haunts the Paris Opera House, causing murder and mayhem in an attempt to make the woman he "loves" a star.
 The film remains most famous for Chaney's ghastly, self-devised make-up, which was kept a studio secret until the film's premiere.
 The film was released on November 25, 1925. Rupert Deese
Rupert Deese (born Rupert Julian Deese and known as Rummy) (July 16, 1924 – July 12, 2010) was an American ceramic artist.
 He is known for innovative design and decoration of high fired ceramics.
 Deese wrote "It is my hope in making these vessels that as the perception of their beauty diminishes over time, they will sustain themselves by pleasant usefulness." The Yankee Clipper (film)
The Yankee Clipper is a 1927 American adventure film produced by Cecil B. DeMille and directed by Rupert Julian.
 It is set against the maritime rivalry between the United States and Great Britain in the mid-19th century. The Kaiser, the Beast of Berlin
The Kaiser, the Beast of Berlin (also known as The Beast of Berlin and The Kaiser) was a 1918 American silent war propaganda melodrama film written by, directed by, and starring Rupert Julian.
 The film's supporting cast included Elmo Lincoln, Nigel De Brulier, and Lon Chaney. Love Comes Along
Love Comes Along is a 1930 American romantic film directed by Rupert Julian, written by Wallace Smith, based on the uncompleted play "Conchita" by Edward Knoblock.
 It was a vehicle specifically picked to highlight the vocal talents of Bebe Daniels, which also starred Lloyd Hughes and Montagu Love.
 It made a profit of $258,000. The Savage (1917 film)
The Savage is a 1917 American silent drama film starring Colleen Moore and Monroe Salisbury that is set in Canada and was directed by Rupert Julian.
 The film is presumed to be lost.