▁econom ist ▁known ▁for ▁his ▁work ▁in ▁dem ography ▁and ▁the ▁history ▁of ▁statistics . ▁ ▁Har ald ▁West er ga ard ▁was ▁born ▁in ▁C open hagen ▁and ▁apart ▁from ▁a ▁period ▁studying ▁in ▁England ▁and ▁Germany ▁in ▁ 1 8 7 7 - 7 8 ▁he ▁lived ▁there ▁all ▁his ▁life . ▁His ▁subject ▁at ▁the ▁University ▁of ▁C open hagen ▁was ▁mathematics ▁but ▁he ▁became ▁interested ▁in ▁econom ics ▁and , ▁while ▁he ▁was ▁in ▁England , ▁he ▁seems ▁to ▁have ▁met ▁William ▁Stanley ▁Je v ons . ▁In ▁the ▁pre face ▁to ▁the ▁second ▁edition ▁( 1 8 7 9 ) ▁of ▁the ▁ ▁Theory ▁of ▁Political ▁Econom y ▁Je v ons ▁refers ▁to ▁West er ga ard ' s ▁mathematical ▁suggestions . ▁However , ▁after ▁this ▁spect ac ular ▁debut ▁West er ga ard ▁seems ▁not ▁to ▁have ▁contributed ▁further ▁to ▁mathematical ▁econom ics . ▁ ▁In ▁ 1 8 8 0 - 2 , ▁West er ga ard ▁worked ▁for ▁the ▁Dan ish ▁In sur ance ▁Office ▁and ▁he ▁developed ▁an ▁interest ▁in ▁dem ography . ▁His ▁international ▁reputation ▁was ▁made ▁by ▁the ▁publication ▁of ▁Die ▁Le hre ▁von ▁der ▁Mort al ität ▁und ▁Mor bil ität ▁( 1 8 8 1 ). ▁This ▁work ▁won ▁him ▁a ▁gold ▁medal ▁from ▁the ▁University ▁and ▁led ▁to ▁his ▁appointment ▁as ▁a ▁lect urer ▁in ▁ 1 8 8 3 . ▁In ▁ 1 8 8 6 , ▁he ▁became ▁a ▁Professor ▁at ▁the ▁early ▁age ▁of ▁ 3