William C. deMille and Harry Keller were both what nationalities? 
Harry Keller: Harry Keller (22 February 1913 – 19 January 1987) was an American film editor, producer and director, who made a number of westerns and worked for many years at Universal Pictures. William C. deMille: William Churchill de Mille (July 25, 1878 – March 5, 1955) was an American screenwriter and film director from the silent movie era through the early 1930s.
American