An American microbiologist who received the Nobel Prize in Physiology or Medicine in 1978 for his discovery of restriction enzymes. He was also the Chief executive of Johns Hopkins University or college in Baltimore from 1995 to 1996. He analyzed chemistry, beliefs and literature in the University or college of Delaware, and received an M.D. level from Washington University or college in 1954. He was presented with the Country wide Medal of Technology in 1993. He was created the final of nine kids to Russian immigrant parents. He visited the University or college of Delaware like Jill Biden.