The life of Albert Einstein has been brought into brilliant focus by Ronald W. Clark's deeply significant and compassionate biography. Mr. Clark has drawn on an immense amount of new material. But he has never lost sight of the man who was one of the greatest contradictions of our times: the German who hated the Germans; the pacifist who changed his mind; the ambivalent Zionist who was asked to head the Israeli state; the physicist who believed in a God.