Franklin was a leading author, printer, political theorist, politician, freemason, postmaster, scientist, inventor, humorist, civic activist, statesman, and diplomat.
As a scientist, he was a major figure in the American Enlightenment and the history of physics for his discoveries and theories regarding electricity. As an inventor, he is known for the lightning rod, bifocals, and the Franklin stove, among other inventions.
Benjamin Franklin's head is on the $100 bill as a way to honor him because of his important contributions to history. One of Benjamin Franklin’s wisest and most famous sayings was, “A penny saved is a penny earned.”
According to Wikipedia