Most people, probably, are in doubt about certain matters ascribed to their past. They may have seen them, may have said them, done them, or they may only have dreamed or imagined they did so.

The intellectual brilliance of the James family milieu and the remarkable epistolary talents of several of its members have made them a subject of continuing interest to historians biographers and critics. He was the brother of novelist Henry James and of diarist Alice James. This article is about the American psychologist and philosopher.