John F. Kennedy mainly known by his initials JFK, was the 35th President of the United States, serving from 1961 until his death in 1963.

Quotes:

"And so, my fellow Americans: ask not what your country can do for you–ask what you can do for your country."

"We observe today not a victory of party but a celebration of freedom"

"If a free society cannot help the many who are poor, it cannot save the few who are rich."

"Let us never negotiate out of fear. But let us never fear to negotiate"

“Mankind must put an end to war before war puts an end to mankind”

“If we are strong, our strength will speak for itself. If we are weak, words will be of no help”

"Victory has a hundred fathers and defeat is an orphan"

Biography:

Served military service as commander of the Motor Torpedo Boats PT-109 and PT-59 during World War II in the South Pacific

Kennedy represented Massachusetts' 11th congressional district in the U.S. House of Representatives from 1947 to 1953 as a Democrat.

Served in the U.S. Senate from 1953 until 1960. 

Kennedy defeated Vice President and Republican candidate Richard Nixon in the 1960 U.S. presidential election. 

At 43 years of age, he is the youngest to have been elected to the office, the second-youngest President (after Theodore Roosevelt), and the first person born in the 20th century to serve as president.

A Catholic, Kennedy is the only non-Protestant president, and is the only president to have won a Pulitzer Prize.

Events during his presidency included the Bay of Pigs Invasion, the Cuban Missile Crisis, the building of the Berlin Wall, the Space Race, the African-American Civil Rights Movement, and early stages of the Vietnam War. 

Kennedy increased the number of military advisers, special operation forces, and helicopters in an effort to curb the spread of communism in South East Asia.

The Kennedy administration adopted the policy of the Strategic Hamlet Program which was implemented by the South Vietnamese government. It involved certain forced relocation, village internment, and segregation of rural South Vietnamese from the northern and southern communist insurgents.

Kennedy was assassinated on November 22, 1963 in Dallas, Texas. Lee Harvey Oswald was charged with the crime, but he was shot and killed by Jack Ruby two days later, before a trial could take place. 

The FBI and the Warren Commission officially concluded that Oswald was the lone assassin. However, the United States House Select Committee on Assassinations (HSCA) concluded that those investigations were flawed and that Kennedy was probably assassinated as the result of a conspiracy.However, ABC News in their investigation, The Kennedy Assassination: Beyond Conspiracy, confirmed the findings of the Warren Commission; having concluded Oswald acted alone.

Kennedy's controversial Department of Defense TFX fighter bomber program led to a Congressional investigation that lasted from 1963 to 1970.

Since the 1960s information concerning Kennedy's private life has come to light. Details of Kennedy's health problems in which he struggled have become better known, especially since the 1990s. Although initially kept secret from the general public, reports of Kennedy's philandering have garnered much press. 

Kennedy ranks highly in public opinion ratings of U.S. presidents.