A writer of adventure novels, Marshall was also a big-game hunter
throughout Africa, French Indo-China, Alaska, Burma, and India, and
called himself an expert tiger-hunter.
Sometimes used the pseudonym "Hall Hunter."
His father, George Edward Marshall, of Illinois, studied law, taught
school, and published a daily newspaper in Rensselaer, Indiana.
Marshall enjoyed visiting the Gold Eagle Tavern in Beaufort, South
Carolina, and gave the proprietors the curry recipe for which the Gold
Eagle's restaurant was famous.
He married Agnes Sharp Flythe in 1920. They had two children, Edison and Nancy.