na August 1940, a họpụtara Jebb na Ministry of Economic Warfare na ọkwa nwa oge nke Assistant Under-Secretary. Mgbe e mesịrị, a họpụtara ya Chief Executive Officer nke Special Operations Executive. Na February 1942, na mgbanwe nke Minista nke Economic Warfare, a napụrụ Jebb ọrụ a wee laghachi na Foreign Office. A họpụtara ya Onye isi nke Ngalaba Mweghachi na 1943 ka ọ bụrụ Onye Ndụmọdụ. N'ọnọdụ a, ọ gara ọtụtụ ogbako mba ụwa, gụnyere ndị dị na Tehran, Yalta, Dumbarton Oaks, na Potsdam. Ajụjụ: Olee mba ndị ọzọ Jebb gara nzukọ na?
Tehran, Yalta, Dumbarton Oaks, na Potsdam.