Dyson akatamira kuUnited States muna 1947 seCommonwealth Fellow kuti awane dhigirii rezvefizikisi naHans Bethe paCornell University (1947<unk>48). Ikoko akasangana naRichard Feynman. Muzvinafundo wechirungu wechirungu akaziva kupenya kweAmerican anotyisa, uye akazvibatanidza nekukurumidza sezvinobvira. Akazoenda kuInstitute for Advanced Study (1948<unk>49), asati adzokera kuEngland (1949<unk>51), kwaaive mushandi wekutsvaga paYunivhesiti yeBirmingham. Muna 1949 Dyson akaratidzira kuenzana kwemaitiro maviri e quantum electrodynamics (QED): Richard Feynman's diagram uye nzira yakagadzirwa naJulian Schwinger naShinir Ward.
Chirongwa cheOrion