▁moved ▁to ▁the ▁Boston ▁area ▁and ▁later ▁become ▁an ▁American ▁citiz en . ▁ ▁University ▁of ▁Heidel berg ▁In ▁June , ▁Par s ons ▁went ▁on ▁to ▁the ▁University ▁of ▁Heidel berg , ▁where ▁he ▁received ▁his ▁Ph D ▁in ▁soci ology ▁and ▁econom ics ▁in ▁ 1 9 2 7 . ▁At ▁Heidel berg , ▁he ▁worked ▁with ▁Alfred ▁We ber , ▁Max ▁We ber ' s ▁brother ; ▁, ▁his ▁dis sert ation ▁advis er ; ▁Emil ▁L eder er ; ▁and ▁Karl ▁Mann heim . ▁He ▁was ▁exam ined ▁on ▁Kant ' s ▁" C rit ique ▁of ▁P ure ▁Re ason " ▁by ▁the ▁phil os opher ▁Karl ▁J asp ers . ▁At ▁Heidel berg , ▁Par s ons ▁was ▁also ▁exam ined ▁by ▁Wil ly ▁Andreas ▁on ▁the ▁French ▁Revolution . ▁Par s ons ▁wrote ▁his ▁Dr . ▁Phil . ▁th esis ▁on ▁The ▁Con cept ▁of ▁Capital ism ▁in ▁the ▁Rec ent ▁German ▁Liter ature , ▁with ▁his ▁main ▁focus ▁on ▁the ▁work ▁of ▁Werner ▁S omb art ▁and ▁We ber . ▁It ▁was ▁clear ▁from ▁his ▁discussion ▁that ▁he ▁rejected ▁S omb art ' s ▁quasi - ide al istic ▁views ▁and ▁supported ▁We ber ' s ▁attempt ▁to ▁strike ▁a ▁balance ▁between ▁historic ism , ▁ideal ism ▁and ▁ne o - K ant ian ism . ▁ ▁The ▁most ▁cru cial ▁encounter ▁for ▁Par s ons ▁at ▁Heidel berg ▁was ▁his ▁encounter ▁with ▁the ▁work ▁of ▁Max ▁We ber ▁about ▁whom ▁he ▁had ▁never ▁heard