In January 1917, despite having previously built a relationship with Moses Gaster, he began looking to meet other Zionist leaders; by the end of the month he had been introduced to Weizmann and his associate Nahum Sokolow, a journalist and executive of the World Zionist Organization who had moved to Britain at the beginning of the war.
Pada Januari 1917, disamping sebelumnya menjalin hubungan dengan Moses Gaster, ia mulai memutuskan untuk mendatangi para pemimpin Zionis lain; pada akhir bulan, ia diperkenalkan kepada Weizmann dan orang sejawatnya Nahum Sokolow, seorang jurnalis dan eksekutif Organisasi Zionis Sedunia yang pindah ke Inggris pada permulaan perang.