9 1 8 ▁to ▁build ▁a ▁department ▁of ▁social ▁service . ▁ ▁Joh ns ▁Hop kins ▁ ▁In ▁ 1 9 1 9 , ▁Park ▁returned ▁to ▁the ▁United ▁States ▁and , ▁in ▁particular : ▁Baltimore , ▁Maryland . ▁Following ▁his ▁research ▁with ▁Dr . ▁How land , ▁Park ▁went ▁to ▁Y ale ▁where ▁he ▁would ▁take ▁on ▁the ▁role ▁as ▁the ▁Professor ▁of ▁Ped iat rics ▁for ▁seven ▁years . ▁In ▁ 1 9 2 7 , ▁Dr . ▁How land ' s ▁un tim ely ▁death ▁caused ▁Park ▁to ▁return ▁to ▁Joh ns ▁Hop kins ▁to ▁take ▁over ▁as ▁the ▁Professor ▁of ▁Ped iat rics ▁and ▁Chief - of - P ed iat rics . ▁In ▁ 1 9 4 6 , ▁Park ▁was ▁also ▁named ▁the ▁Professor ▁Emer it us ▁of ▁Ped iat rics ▁at ▁the ▁School ▁of ▁Medicine . ▁As ▁Chief - of - P ed iat rics ▁of ▁the ▁Joh ns ▁Hop kins ▁Hospital , ▁Park ▁established ▁multiple ▁special ty ▁clin ics ▁under ▁ped iat rics , ▁with ▁the ▁t uber cul osis , ▁card iac , ▁end ocr ine , ▁and ▁psych iat ric ▁clin ics ▁bringing ▁fame ▁to ▁the ▁Har ri et ▁Lane ▁Home . ▁He ▁was ▁also ▁known ▁for ▁his ▁daily ▁no on ▁con ferences ▁with ▁his ▁staff ▁where ▁an ▁intern , ▁resident ▁and ▁sub - special ist ▁would ▁all ▁review ▁a ▁case . ▁After ▁they ▁presented ▁Park ▁would ▁question ▁all ▁parts , ▁review ing ▁all ▁steps ▁and ▁small ▁details . ▁Of ▁his ▁questions ,