Question: William C. deMille and Harry Keller were both what nationalities? 
Sentence (from "William C. Morris Award"): It was named for twentieth-century American publisher William C. Morris (born 1928 or 1929 and raised up in Eagle Pass, Texas, died Sept 28, 2003 in Manhattan), whom YALSA calls an innovator and "an influential innovator in the publishing world and an advocate for marketing books for children and young adults".
Relevant evidence: No