Anderson, Carl David (1905-1991), a United States physicist noted for his studies of cosmic rays. Anderson shared the 1936 Nobel Prize in physics for his discovery in 1932 of the positron, a positively charged subatomic particle with the mass of an electron. In 1936 he and Seth Neddermeyer announced they had discovered the mesotron (now called muon), a subatomic particle larger than an electron but smaller than a proton.
Anderson was born in New York City. He received his Ph.D. degree in 1930 from the California Institute of Technology, where he became a professor of physics in 1939.