Baruch Samuel Blumberg — known as Barry Blumberg — was an American physician, geneticist, and co-recipient of the 1976 Nobel Prize in Physiology or Medicine, for his work on the hepatitis B virus while an investigator at the NIH. He was president of the American Philosophical Society from 2005 until his death.
Blumberg and Gajdusek received the Nobel Prize for discovering "new mechanisms for the origin and dissemination of infectious diseases." Blumberg identified the hepatitis B virus, and later developed its diagnostic test and vaccine.