John F. Kennedy was in office for 2 years and 10 months. He defeated Richard Nixon to become the 35th President on January 20, 1961. He was assassinated by Lee Harvey Oswald while riding in a motorcade in Dallas, TX on November 22, 1963.
JFK was born in Brookline, MA on May 29, 1917. He was the first Roman Catholic to become President and as of 2014, the youngest to be elected President (at age 43.) His vice President was Lyndon B. Johnson, who was sworn in as President upon JFK's death. During his time in office, JFK ordered the "Bay of Pigs Invasion," oversaw the Cuban missile crisis and established the Peace Corps.
JFK married Jacqueline Bouvier on September 12, 1953. They had four children: Arabella (who was stillborn,) Caroline, John Jr. and Patrick. Patrick died in infancy.