Rockefeller's father was a snake-oil saleman.
The tycoon’s father, William Avery Rockefeller, was a traveling snake-oil salesman who posed as a deaf-mute peddler and hawked miracle drugs and herbal remedies. The smooth-talking huckster dubbed “Devil Bill” alternately fathered children—including the future industrialist—with his wife and mistress, the couple’s live-in housekeeper. The itinerant William Rockefeller also lived a double life posing as an eye-and-ear specialist named Dr. William Levingston, and in 1855 he secretly married another woman.