When John A. Marchant was born on 10 September 1889, in London, England, United Kingdom, his father, John Marchant, was 24 and his mother, Louise Stutchberry, was 31. He married Mignon C Hagan on 29 March 1913, in Marin, California, United States. They were the parents of at least 1 daughter. He lived in Abbots Langley, Hertfordshire, England, United Kingdom in 1891. He died on 8 March 1963, in Los Angeles, Los Angeles, California, United States, at the age of 73.