Onassis, Aristotle Socrates, oh NAS ihs, AR ih stot uhl SOK ruh teez (1905?-1975), a Greek businessman, was for many years one of the world's wealthiest people. His private life was noteworthy as well, particularly his lengthy relationship with opera diva Maria Callas and his marriage in 1968 to Jacqueline Bouvier Kennedy, the widow of United States President John F. Kennedy.