▁to ▁ 1 9 5 3 , ▁and ▁at ▁the ▁Greg or ian ▁University ▁from ▁ 1 9 5 3 ▁to ▁ 1 9 6 4 . ▁At ▁the ▁Greg or ian , ▁L on er gan ▁taught ▁Tr inity ▁and ▁Christ ology ▁in ▁alternate ▁years , ▁and ▁produced ▁substantial ▁text books ▁on ▁these ▁topics . ▁In ▁ 1 9 6 4 , ▁he ▁made ▁another ▁hast y ▁return ▁to ▁North ▁America , ▁this ▁time ▁to ▁be ▁treated ▁for ▁lung ▁cancer . ▁He ▁was ▁appointed ▁again ▁to ▁Reg is ▁College ▁from ▁ 1 9 6 5 ▁to ▁ 1 9 7 5 , ▁was ▁Still man ▁Professor ▁of ▁Div inity ▁at ▁Harvard ▁University ▁in ▁ 1 9 7 1 - 7 2 , ▁and ▁Dist ingu ished ▁Vis iting ▁Professor ▁at ▁Boston ▁College ▁from ▁ 1 9 7 5 ▁until ▁ 1 9 8 3 . ▁He ▁died ▁at ▁the ▁Jes uit ▁inf irm ary ▁in ▁Pick ering , ▁Ontario , ▁on ▁ 2 6 ▁November ▁ 1 9 8 4 . ▁ ▁In flu ences ▁ ▁L on er gan ▁names ▁August ine ▁and ▁John ▁Henry ▁New man ▁as ▁major ▁influ ences ▁upon ▁his ▁early ▁thinking . ▁J . ▁A . ▁Stewart ' s ▁study ▁of ▁Pl ato ' s ▁doctrine ▁of ▁ideas ▁was ▁also ▁influ ential . ▁ ▁In ▁the ▁ep ilog ue ▁to ▁Ins ight , ▁L on er gan ▁mentions ▁the ▁important ▁personal ▁transformation ▁wr ought ▁in ▁him ▁by ▁a ▁de cade ' s ▁app rent ices hip ▁to