John Fitzgerald KennedyJohn Fitzgerald Kennedy John Fitzgerald Kennedy 35th president of the United States, the youngest person ever to be elected president. He was also the first Roman Catholic president and the first president to be born in the 20th century. Kennedy was assassinated before he completed his third year as president. Therefore his achievements were limited. Nevertheless, his influence was worldwide, and his handling of the Cuban Missile Crisis may have prevented war. Young people especially liked him.