The person on the United States $100 bill is Benjamin Franklin. His portrait first appeared on $100 notes in 1929, and this design remains largely unchanged today.
An earlier portrait of Benjamin Franklin by Joseph-Siffred Duplessis ran on all $100 bills from 1929 until 1993. In 1996 a portrait of an older Benjamin Franklin by the same painter was used.
Benjamin Franklin was a printer by trade and published many works, including "Poor Richard's Almanac." In 1743, he began concentrating on science and experiments, inventing a heat-efficient stove, swim fins and bifocals. The most notable of his contributions to science is his famous experiment with lightning and kites, which confirmed the nature of electricity.