▁of ▁Richard ▁Fe yn man . ▁The ▁bud ding ▁English ▁phys ic ist ▁recognized ▁the ▁br ill iance ▁of ▁the ▁fl am boy ant ▁American ▁and ▁worked ▁with ▁him . ▁He ▁then ▁moved ▁to ▁the ▁Institute ▁for ▁Advanced ▁Study ▁( 1 9 4 8 – 1 9 4 9 ), ▁before ▁returning ▁to ▁England ▁( 1 9 4 9 – 5 1 ), ▁where ▁he ▁was ▁a ▁research ▁fellow ▁at ▁the ▁University ▁of ▁B irmingham . ▁ ▁In ▁ 1 9 4 9 , ▁D ys on ▁demonstrated ▁the ▁equivalence ▁of ▁two ▁form ulations ▁of ▁quantum ▁elect rod ynam ics ▁( Q ED ): ▁Richard ▁Fe yn man ' s ▁diag rams ▁and ▁the ▁operator ▁method ▁developed ▁by ▁Julian ▁Schw inger ▁and ▁Shin ' ich ir ō ▁Tom on aga . ▁He ▁was ▁the ▁first ▁person ▁after ▁their ▁cre ator ▁to ▁appreciate ▁the ▁power ▁of ▁Fe yn man ▁diag rams ▁and ▁his ▁paper ▁written ▁in ▁ 1 9 4 8 ▁and ▁published ▁in ▁ 1 9 4 9 ▁was ▁the ▁first ▁to ▁make ▁use ▁of ▁them . ▁He ▁said ▁in ▁that ▁paper ▁that ▁Fe yn man ▁diag rams ▁were ▁not ▁just ▁a ▁computational ▁tool ▁but ▁a ▁physical ▁theory ▁and ▁developed ▁rules ▁for ▁the ▁diag rams ▁that ▁completely ▁solved ▁the ▁ren ormal ization ▁problem . ▁D ys on ' s ▁paper ▁and ▁also ▁his ▁lect ures ▁presented ▁Fe yn man ' s ▁theories ▁of ▁Q ED ▁in ▁a ▁form ▁that ▁other ▁phys ic ists ▁could ▁understand , ▁facil it ating ▁the ▁physics ▁community '