. . "Gunter Wittenberg: copy personal papers"@eng . "During the war years he became a secret intermediary, the confidant of such major figures as Chaim Weizmann and Albert Einstein, as well as hundreds of others, for whom he was able to arrange escapes, on account of his dual nationality and familiarity with Gestapo extortion techniques."@eng . "Gunter Wittenberg: copy personal papers"@eng . .