As he was growing up, William Antholis says, he was always made aware of "the large political forces of the 20th century" that had shaped his family, Greek immigrants uprooted by World War II. Mr. Antholis, newly named director and chief executive of the Miller Center, an affiliate of the University of Virginia, recalls learning from his schoolteacher mother about the Hellenic roots of Western political culture. From the whole proud family, he knew that his grandfather was John F. Kennedy’s barber during his Senate years.