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.
Arthur John Booker Arthur John Booker, M.D. (October 31, 1881 – August 25, 1957) was a prominent community activist and health advocate who worked in Des Moines, Iowa and Los Angeles, California. He also served as a physician with the 365th Infantry Regiment of the 92nd Division during World War I, where many of the African American soldiers served.