Psychohistory is the attempt to fuse the insights of psychology and psychoanalysis with those of history, and the big league of the burgeoning academic movement is the annual Wellfleet seminar on Cape Cod. At this year's closed meeting, such luminaries as Kenneth Keniston and Robert Jay Lifton were there. So was Erik Erikson (Young Man Luther, Gandhi's Truth), the founding spirit of the movement and the group. But the center of attention this year was Doris Kearns, probably the first aspiring psychohistorian to be prodded into print by her subject.
Kearns, 31, an associate professor of government at Harvard, is a...