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Albert Claude (August 24, 1899 - May 22, 1983) was a Belgian biologist who won the Nobel Prize in Physiology or Medicine in 1974. He studied medicine at the University of Liege (Belgium). During the winter of 1928-29 he worked in Berlin, first at the Institut für Krebsforschung, and then at the Kaiser Wilhelm Institute for Biology, Dahlem. In the summer of 1929 he joined the Rockefeller Institute. While working at Rockefeller University in the 1930s and 1940s, he used the electron microscope to make images of cells which deepened the scientific understanding of cellular structure and function. He discovered the chloroplasts in the cell.