He married Frances Riley; the couple had seven children — two girls and five boys.

[2] From 1907 to 1919, Miller was employed as a physicist with the National Bureau of Standards; he then worked as a radio engineer at the United States Navy's Radio Laboratory in Anacostia, District of Columbia from 1919 to 1923, and subsequently at the Naval Research Laboratory (NRL).

From 1925 to 1936, he led radio receiver research at the Atwater Kent Manufacturing Company, Philadelphia.

From 1936 to 1940, he was the assistant head of the research laboratory for the RCA Radiotron Company.

[3] Miller was awarded the Distinguished Civilian Service Award in 1945 for "initiation of the development of a new flexible radio-frequency cable urgently needed in radio and radar equipment which solved a desperate material shortage in the United States during World War II," and the IRE Medal of Honor in 1953 for "his pioneering contributions to our basic knowledge of electron tube theory, of radio instruments and measurements, and of crystal controlled oscillators."