1 7 2 2 ▁and ▁ 1 7 3 4 - 1 7 3 5 . ▁ ▁Business ▁After ▁his ▁school ing ▁in ▁London , ▁Nor ris ▁returned ▁to ▁manage ▁the ▁family ▁business , ▁Nor ris ▁and ▁Company , ▁on ▁beh alf ▁of ▁his ▁a iling ▁father . ▁After ▁his ▁father ▁died ▁in ▁ 1 7 3 5 , ▁the ▁junior ▁Isaac ▁became ▁a ▁senior ▁partner . ▁ ▁Mar riage ▁and ▁family ▁Well ▁established ▁after ▁inher iting ▁money ▁and ▁property ▁from ▁his ▁father , ▁in ▁ 1 7 3 9 ▁Nor ris ▁married ▁Sarah ▁Log an , ▁the ▁el dest ▁daughter ▁of ▁James ▁Log an , ▁also ▁a ▁prominent ▁man ▁in ▁the ▁city , ▁and ▁his ▁wife . ▁In ▁ 1 7 4 2 ▁they ▁moved ▁out ▁of ▁the ▁city ▁and ▁res ett led ▁at ▁the ▁Nor ris ▁family ▁estate , ▁" F air hill " ▁in ▁what ▁is ▁now ▁the ▁Northern ▁Libert ies ▁section ▁of ▁Philadelphia . ▁ ▁Political ▁career ▁Eng aged ▁in ▁business ▁until ▁ 1 7 4 3 , ▁Nor ris ▁had ▁acquired ▁a ▁large ▁fortune , ▁in ▁addition ▁to ▁what ▁he ▁inherited ▁from ▁his ▁father . ▁He ▁retired ▁from ▁business ▁to ▁dev ote ▁himself ▁to ▁politics ▁and ▁public ▁life . ▁ ▁Polit ics ▁Like ▁his ▁father ▁before ▁him , ▁Nor ris ▁entered ▁into ▁politics ▁at ▁an ▁early ▁age . ▁He ▁served ▁as ▁a ▁council man ▁and ▁al der man , ▁a ▁member ▁of ▁the ▁Pennsylvania ▁Provin cial ▁Assembly ▁in ▁ 1 7 3 4 , ▁and ▁chairman ▁of ▁its