. ▁Several ▁years ▁later , ▁his ▁parents ▁moved ▁to ▁Three ▁R ivers , ▁Michigan , ▁where ▁he ▁graduated ▁from ▁high ▁school . ▁He ▁went ▁to ▁Massachusetts ▁Institute ▁of ▁Technology ▁( MIT ) ▁as ▁an ▁under grad uate ▁student ▁in ▁ 1 9 2 0 . ▁When ▁he ▁graduated ▁from ▁M IT ▁in ▁ 1 9 2 4 , ▁he ▁briefly ▁worked ▁for ▁General ▁Electric . ▁In ▁ 1 9 2 5 ▁he ▁returned ▁to ▁M IT ▁as ▁research ▁assistant ▁and ▁instruct or ▁in ▁ 1 9 2 6 . ▁he ▁obtained ▁his ▁Master ' s ▁degree ▁in ▁ 1 9 2 9 ▁and ▁his ▁Doctor ▁of ▁Science ▁degree ▁in ▁ 1 9 3 1 . ▁ ▁In ▁ 1 9 3 4 ▁Haz en ▁published ▁two ▁papers ▁on ▁the ▁theory ▁and ▁design ▁of ▁serv ome chan isms ▁which ▁provided ▁clear ▁descri ptions ▁of ▁the ▁operation ▁of ▁serv os ▁and ▁a ▁design ▁method ology . ▁ ▁After ▁ 1 9 3 7 ▁Haz en ▁became ▁increasing ly ▁involved ▁in ▁teaching ▁and ▁administrative ▁work , ▁becoming ▁Head ▁of ▁Department ▁in ▁ 1 9 3 8 ▁and ▁serving ▁for ▁four teen ▁years . ▁From ▁December ▁ 1 9 4 2 ▁until ▁ 1 9 4 6 ▁he ▁was ▁head ▁of ▁Division ▁ 7 , ▁" Fire ▁Control ", ▁of ▁the ▁N DR C ▁( National ▁Def ence ▁Research ▁Committee ). ▁In ▁ 1 9 5 2 ▁he ▁became ▁Dean ▁of ▁the ▁M IT ▁Gr adu ate ▁School ▁until ▁his ▁ret irement ▁in ▁ 1 9 6