. ▁He ▁instead ▁deb ated ▁between ▁a ▁career ▁in ▁medicine ▁and ▁a ▁career ▁in ▁teaching ▁Greek . ▁He ▁eventually ▁decided ▁to ▁purs ue ▁medicine ▁shortly ▁after ▁gradu ating ▁from ▁Y ale . ▁Park ▁first ▁received ▁his ▁M . D . ▁from ▁the ▁Columbia ▁University ▁College ▁of ▁Phys icians ▁and ▁Sur ge ons ▁in ▁ 1 9 0 5 ▁and ▁then ▁went ▁on ▁to ▁become ▁an ▁intern ▁at ▁the ▁Ro ose vel t ▁Hospital ▁in ▁New ▁York ▁from ▁ 1 9 0 5 - 1 9 0 7 . ▁He ▁spent ▁the ▁next ▁two ▁years ▁intern ing ▁at ▁the ▁New ▁York ▁Found ling ▁Hospital , ▁working ▁for ▁six ▁months ▁in ▁ped iat rics ▁where ▁Dr . ▁John ▁How land ▁was ▁an ▁att ending ▁phys ician . ▁Park ▁also ▁spent ▁several ▁months ▁at ▁the ▁City ▁Hospital ▁on ▁Black well ▁Island , ▁where ▁he ▁would ▁cultiv ate ▁path ological ▁skills ▁and ▁insight ▁cru cial ▁to ▁his ▁later ▁research ▁in ▁cr ick ets . ▁ ▁Career ▁ ▁Early ▁career ▁ ▁After ▁comple ting ▁his ▁intern ships , ▁Park ▁first ▁got ▁a ▁job ▁in ▁private ▁practice ▁from ▁ 1 9 0 9 ▁- ▁ 1 9 1 2 ▁where ▁he ▁worked ▁for ▁Dr . ▁The odore ▁Jan ew ay ▁as ▁an ▁office ▁assistant . ▁It ▁was ▁with ▁Dr . ▁Jan ew ay ▁that ▁Park ▁published ▁his ▁first ▁paper ▁in ▁ 1 9 1 0 ▁that ▁focused ▁on ▁the ▁contra ctions ▁of ▁ar ter ies , ▁which ▁they ▁had ▁studied ▁in ▁vit ro . ▁In ▁ 1 9 1