Paul Kennedy, a Yale historian, goes further, saying that the nation's military responsibilities are eroding its economic advantages.

Donald Kagan, a Yale historian, believes that Aspasia was particularly unpopular in the years immediately following the Samian War.

Mr. Palmer is a retired Yale historian.

A Yale historian assays social and political forces and how they will affect the future.

A Yale historian assays social and political forces.

Their generational quartet is "just too wooden" and "just too neat," says one Yale historian.

"It is less necessary to use back channels," said John Lewis Gaddis, the Yale historian.

"The world is coming to the end of another century, and its number one power is faltering," writes Mr. Kennedy, a Yale historian.

She married Paul Kennedy, the author and Yale historian, in 1967.