- John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to as JFK, was an American politician who served as the 35th president of the United States from 1961 until his assassination in 1963. He was the youngest person elected president. Kennedy served at the height of the Cold War, and the majority of his foreign policy concerned relations with the Soviet Union and Cuba. A Democrat, Kennedy represented Massachusetts in both houses of the United States Congress prior to his presidency.