WereMaurice Elvey and Arthur Lubin both from the USA?
Arthur Lubin Arthur Lubin (July 25, 1898 – May 12, 1995) was an American film director and producer who directed several "Abbott & Costello" films, "Phantom of the Opera" (1943), the "Francis the Talking Mule" series and created the talking-horse TV series "Mister Ed". A prominent director for Universal Pictures in the 1940s and 1950s, he is perhaps best known today as the man who gave Clint Eastwood his first contract in film.
Samuel Hoffenstein Samuel "Sam" Hoffenstein (October 8, 1890 - October 6, 1947) was a screenwriter and a musical composer. Born in Russia, he emigrated to the United States and began a career in New York City as a newspaper writer and in the entertainment business. In 1931 he moved to Los Angeles, where he lived for the rest of his life and where he wrote the scripts for over thirty movies. These movies included "Dr. Jekyll and Mr. Hyde" (1931), "The Miracle Man" (1932), "Phantom of the Opera" (1943), "The Wizard of Oz" (1939), "Tales of Manhattan" (1942), "Flesh and Fantasy" (1943), "Laura" (1944), and Ernst Lubitsch's "Cluny Brown" (1946).