Renato Dulbecco

Renato Dulbecco (February 22, 1914 – February 19, 2012) was an Italian-born American virologist who won the 1975 Nobel Prize in Physiology or Medicine for his work on oncogenes. Oncogenes are genes in viruses that cause cancer when they infect animal cells. 
The prize was shared with Howard Temin and David Baltimore.
Dulbecco studied at the University of Turin under Giuseppe Levi. His fellow students Salvador Luria and Rita Levi-Montalcini also moved to the U.S. with him and won Nobel prizes. He was drafted into the Italian army in World War II, but later joined the resistance.