Charles Francis Richter
Charles Francis Richter (April 26, 1900 – April 20, 1985), was an American seismologist, born in Hamilton, Ohio. He is most famous as the creator of the Richter Magnitude Scale, which quantifies the size of earthquakes. He first used the scale in 1935. He developed the scale in collaboration with Beno Gutenberg; both worked at the California Institute of Technology.