John Fitzgerald "Jack" Kennedy (May 29, 1917 – November 22, 1963), often referred to by his initials JFK, was the 35th President of the United States, serving from 1961 until his assassination in 1963.
This portrait is by Elaine Fried de Kooning, wife of Willem de Kooning:
http://www.dailyartfixx.com/2012/03/12/elaine-fried-de-kooning-1918-1989-2/