Joseph Goldberger, 1874–1929, American medical research worker, b. Austria-Hungary, grad. Bellevue Hospital Medical College, 1895. He came to the United States at the age of six. He joined the U.S. Public Health Service in 1899, specializing in preventive medicine, infectious diseases, and nutrition. Working on pellagra, he discovered the cause to be deficiency of a nutritive factor that he called "pellagra preventive" (P-P), now known to be niacin (nicotinic acid).