Na ka neke Dyson ki te United States i roto i te 1947 rite te Commonwealth Fellow ki te whiwhi i te pūtaiao doctorate ki Hans Bethe i Cornell University (1947<unk>48). I reira i hanga e ia te mohio o Richard Feynman. mohio te pūtaiao Ingarihi budding i te brilliance o te American papai, a piri ia rite hohoro rite taea. ka neke ia ki te Institute for Advanced Study (1948<unk>49), i mua i te hoki ki Ingarangi (1949<unk>51), i reira ko ia he hoa rangahau i te University o Birmingham.I roto i te 1949 Dyson whakakitea te ōrite o rua ngā o te electrodynamics quantum (QED): Richard Feynman o mahere me te tikanga whakawhanakehia e Julian Schwinger me Shinir Ward. Ko ia te tangata tuatahi i muri i to ratou kaihanga ki te mana o Feynman o Cornell me tona pūtaiao e pā ana ki te pūtaiao i roto i te Whare Wānanga o Princeton (1947<unk>48). i reira i hanga e ia te ingoa o John Feynman i roto i te pukapuka o te kaiako o te United States i roto i te tau 1953
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