John Fitzgerald Kennedy ( May 29 , 1917 - November 22 , 1963 ) , commonly known as `` Jack '' or by his initials JFK , was an American politician who served as the 35th President of the United States from January 1961 until he was assassinated in November 1963 .
John Fitzgerald Kennedy ( May 29 , 1917 - November 22 , 1963 ) , commonly known as `` Jack '' or by his initials JFK , was the 35th President of the United States .