Salvador Edward Luria ( Turin , Italy , August 13 , 1912 -- Lexington , Massachusetts , February 6 , 1991 ) was an Italian microbiologist . Salvador Edward Luria ( Turin , August 13 , 1912 -- Lexington , February 6 , 1991 ) was an Italian microbiologist and a Nobel laureate ( Nobel Prize in Physiology or Medicine ) for his pioneering work with Max DelbrÃ 1\/4 ck and Alfred Hershey on phages in molecular biology .