Muller, Hermann Joseph (1890-1967), a United States geneticist. Experimenting with fruit flies, Muller found that mutations (changes in the structure of the genes) can be produced by X rays.
Hershey, Alfred Day (1908-1997) was an American biologist. He shared the 1969 Nobel Prize in physiology or medicine with the German-born American biologist Max Delbrück and the Italian-born American biologist Salvador Edward Luria for their work on bacteriophages, viruses that attack bacteria. See more »