Dyson ya koma Amurka a 1947 a matsayin dan takarar Commonwealth don samun digiri a fannin kimiyyar lissafi tare da Hans Bethe a Jami'ar Cornell (1947<unk>48). A can ya yi sanarwa da Richard Feynman. Masanin kimiyyar lissafi na Ingilishi ya fahimci kwarewar Amurkawa mai ban sha'awa, kuma ya haɗa kansa da sauri. Daga nan sai ya koma Cibiyar Nazarin Ci gaba (1948<unk>49), kafin ya koma Ingila (1949<unk>51), inda ya kasance mai bincike a Jami'ar Birmingham. A shekara ta 1949 Dyson ya nuna daidaito na nau'o'i biyu na electrodynamics (QED): Richard Feynman ta zane-zane da kuma hanyar da Julian Schwinger da Shin Shin Ward suka bunkasa.
Shirin Orion