do ctor al ▁program . ▁In ▁ 1 9 6 8 ▁Joh ri ▁was ▁appointed ▁reader ▁in ▁mathematics ▁at ▁Gor akh pur ▁University . ▁Between ▁ 1 9 7 0 ▁and ▁ 1 9 7 2 , ▁Joh ri ▁worked ▁as ▁UN ES CO ▁consult ant ▁to ▁Government ▁of ▁Iran ▁under ▁United ▁Nations ▁Development ▁Program ▁at ▁Te her an . ▁Joh ri ▁was ▁elected ▁a ▁Fellow ▁of ▁Royal ▁Astronom ical ▁Society ▁of ▁London ▁in ▁ 1 9 7 8 . ▁ ▁Joh ri ▁accepted ▁the ▁position ▁of ▁professor ▁of ▁cosm ology ▁at ▁the ▁Mathemat ics ▁Department ▁of ▁Indian ▁Institute ▁of ▁Technology , ▁Mad ras ▁( Ch en na i ) ▁in ▁ 1 9 8 0 . ▁In ▁addition ▁to ▁teaching ▁and ▁advis ing ▁Ph D ▁students , ▁he ▁introduced ▁new ▁courses ▁on ▁general ▁relativ ity ▁and ▁cosm ology . ▁In ▁ 1 9 8 4 , ▁he ▁discovered ▁the ▁first ▁model ▁of ▁' power ▁law ▁infl ation ' ▁under ▁Br ans – D ic ke ▁theory ▁( l ater ▁on ▁called ▁as ▁' ext ended ▁infl ation ') ▁along ▁with ▁his ▁student ▁C . Math iz h agan . ▁Joh ri ▁worked ▁on ▁various ▁visit ing ▁assign ments ▁at ▁National ▁University ▁( K uw ait ), ▁International ▁Centre ▁for ▁The oret ical ▁Physics , ▁Tri este ▁( Ital y ), ▁Cop ern icus ▁Astronom ical ▁Institute , ▁Polish ▁Academy ▁of ▁Sciences ▁( W ars aw ), ▁National ▁University ▁of ▁Singapore , ▁South ▁West ▁Techn ical ▁University ▁of ▁Sydney ; ▁Australian ▁National ▁University