Who are the only two Americans to appear on the us coin who are not presidents?

In print, only four men have appeared on American currency which were not presidents. The first was Alexander Hamilton on the ten dollar bill. The second was Benjamin Franklin on the hundred-dollar bill the third Head of the Treasury, Salmon Chase, on the $10,000 bill and the fourth was John Marshall who was the fourth Chief Justice of the Supreme Court from 1801-1835, on the $500 bill.