Baruj Benacerraf (1920-2011) was a Venezuelan-American immunologist, who shared the 1980 Nobel Prize in Physiology or Medicine for the “discovery of the major histocompatibility complex genes which encode cell surface protein molecules important for the immune system’s distinction between self and non-self.” He was photographed on this day, July 25, in 1988, with his Sitting record referencing his role at the Dana Farber Cancer Center where he was president from 1980-92.