oh an ▁Lee ▁Y oh an ▁Lee ▁is ▁one ▁of ▁Sal vor ▁Hard in ' s ▁advis ors ▁and ▁friends . ▁ ▁Y ugo ▁Am ary l ▁Y ugo ▁Am ary l , ▁along ▁with ▁H ari ▁S eld on , ▁worked ▁on ▁psych oh istory ▁until ▁his ▁death ▁at ▁age ▁ 5 2 . ▁As im ov ▁f les hes - out ▁the ▁character ' s ▁orig ins ▁in ▁P rel ude ▁to ▁Foundation ▁( 1 9 8 8 ). ▁Am ary l ▁was ▁born ▁on ▁Tr ant or ▁in ▁the ▁D ahl ▁sector . ▁He ▁worked ▁as ▁a ▁" he ats ink er ", ▁one ▁of ▁many ▁people ▁t ending ▁the ▁vast ▁sub ter rane an ▁operations ▁that ▁generate ▁energy ▁from ▁heat ▁in ▁the ▁deep ▁re cess es ▁of ▁the ▁planet . ▁The ▁work ▁was ▁hard , ▁hot ▁and ▁did ▁not ▁require ▁great ▁intelligence . ▁These ▁men ial ▁workers ▁t ended ▁to ▁be ▁o stra ci zed ▁by ▁those ▁not ▁forced ▁to ▁work ▁under ground . ▁ ▁Am ary l ▁managed ▁to ▁discover ▁and ▁study ▁mathematics ▁with ▁the ▁help ▁of ▁a ▁friendly ▁li br arian . ▁He ▁met ▁S eld on ▁when ▁the ▁latter ▁visited ▁the ▁he ats ink ▁complex ▁out ▁of ▁curiosity ▁whilst ▁fle eing ▁from ▁E to ▁Dem er zel ▁and ▁living ▁in ▁D ahl . ▁S eld on ▁immediately ▁recognized ▁and ▁fost ered ▁Am ary l ' s ▁inn ate ▁mathematical ▁ab ilities ▁and ▁was ▁able ▁to ▁get ▁him ▁into ▁University . ▁He ▁eventually ▁gained ▁a ▁doctor ate