▁von ▁Ulrich ▁Th i eme ▁und ▁Felix ▁Be cker . ▁Band ▁ 1 7 : ▁He ub el – Hub ard . ▁E . ▁A . ▁Se emann , ▁Leipzig ▁ 1 9 2 4 , ▁S . ▁ 1 0 6 . ▁ ▁References ▁▁ ▁category : 1 8 0 6 ▁birth s ▁category : 1 8 9 0 ▁death s ▁category : G erman ▁academ ics ▁category : 1 9 th - century ▁German ▁pain ters ▁Category : Pe ople ▁from ▁Ober all g äu <0x0A> </s> ▁Er ica ▁H ahn , ▁M . D . ▁is ▁a ▁fict ional ▁character ▁from ▁the ▁American ▁Broadcast ing ▁Company ▁( ABC ) ▁medical ▁drama ▁television ▁series ▁Grey ' s ▁An atom y , ▁port rayed ▁by ▁actress ▁Bro oke ▁Smith . ▁H ahn ▁was ▁a ▁rec urr ing ▁character ▁through ▁the ▁show ' s ▁second ▁and ▁third ▁seasons , ▁and ▁joined ▁the ▁main ▁cast ▁in ▁the ▁fourth ▁season . ▁Prior ▁to ▁assuming ▁the ▁role , ▁Smith ▁observed ▁heart ▁surg ery ▁being ▁performed , ▁and ▁admitted ▁to ▁finding ▁stress ful ▁the ▁pressure ▁of ▁contin ually ▁port ray ing ▁a ▁medical ▁professional ▁real ist ically . ▁ ▁The ▁character ▁is ▁presented ▁as ▁highly ▁professional , ▁to ▁the ▁point ▁of ▁being ▁a ▁" work ah ol ic ". ▁She ▁is ▁not ably ▁hard ▁on ▁Res ident ▁Crist ina ▁Yang ▁( S andra ▁Oh ), ▁adm itting ▁that ▁Crist ina ▁rem inds ▁her ▁of ▁herself ▁as ▁a ▁student . ▁Despite ▁her ▁intent ions ▁to ▁keep ▁away ▁from