Carl D. Anderson was an American physicist born on September 3, 1905, in New York City. He is best known for his discovery of the positron, the antiparticle of the electron, in 1932. This groundbreaking work provided crucial evidence for the theory of quantum mechanics and contributed to the understanding of antimatter. Anderson's research earned him the Nobel Prize in Physics in 1936, which he shared with Victor Francis Hess. Throughout his career, he made significant contributions to the field of particle physics and worked on various experiments involving cosmic rays and other subatomic particles until his passing in 1991.