vision ▁of ▁Karl - O tto ▁Ap el ▁in ▁Frankfurt . ▁ ▁Academ ic ▁career ▁▁ ▁Le il ich ▁studied ▁philosophy , ▁lingu istics ▁and ▁c atholic ▁the ology ▁at ▁the ▁Go ethe ▁University ▁Frankfurt ▁where , ▁in ▁ 1 9 8 2 , ▁he ▁was ▁awarded ▁his ▁doctor al ▁degree ▁in ▁philosophy ▁for ▁his ▁th esis ▁Ludwig ▁W itt gen stein ▁entitled ▁" The ▁Aut onomy ▁of ▁Language " ▁( ), ▁a ▁study ▁about ▁the ▁late ▁philosophy ▁of ▁W itt gen stein . ▁ ▁Since ▁ 1 9 7 9 ▁he ▁was ▁affili ated ▁with ▁the ▁University ▁of ▁Ant werp , ▁where ▁he ▁became ▁a ▁professor ▁of ▁philosophy , ▁chairman ▁of ▁the ▁department ▁of ▁philosophy , ▁as ▁well ▁as ▁chairman ▁of ▁the ▁working ▁group ▁of ▁philosoph ical ▁psych ology . ▁He ▁was ▁also ▁a ▁found ing ▁member ▁of ▁the ▁" Inst itute ▁of ▁Jewish ▁Studies ▁( I JS )" ▁() ▁at ▁the ▁mentioned ▁university . ▁He ▁also ▁became ▁a ▁member ▁of ▁the ▁board ▁of ▁direct ors ▁of ▁the ▁same ▁I JS . ▁ ▁Among st ▁the ▁courses ▁which ▁Le il ich ▁taught ▁at ▁the ▁University ▁of ▁Ant werp ▁are ▁" Cont empor ary ▁Anal yt ical ▁Philosoph y ", ▁" Ph il osoph y ▁of ▁Language ", ▁" Log ic " ▁and ▁" E p ist em ology ▁and ▁Philosoph y ▁of ▁Science ". ▁Le il ich ▁was ▁noted ▁for ▁his ▁unusual ▁method ▁of ▁step wise ▁grad ing ▁during ▁ex ams . ▁ ▁In ▁ 2 0 1 4 , ▁Le il