, ▁Ma ior ▁offered ▁his ▁expert ise ▁to ▁the ▁Roman ian ▁authorities , ▁becoming ▁director ▁general ▁of ▁Post s , ▁Te legraph s ▁and ▁Tele ph ones ▁of ▁Trans ylvan ia ▁and ▁Ban at . ▁Al most ▁simultaneously , ▁in ▁July ▁ 1 9 1 9 , ▁he ▁was ▁appointed ▁professor ▁at ▁the ▁University ▁of ▁Cl uj ▁and ▁then ▁director ▁of ▁the ▁Institute ▁of ▁The oret ical ▁Physics ▁and ▁the ▁Fac ulty ▁of ▁Technology . ▁During ▁ 1 9 2 9 - 1 9 4 6 ▁he ▁served ▁as ▁de an ▁of ▁the ▁fac ulty . ▁He ▁taught ▁physics ▁courses ▁containing ▁many ▁modern ▁ideas ▁such ▁as ▁" E lect ric ity ▁and ▁Mag net ism " ▁and ▁" ac oust ics ▁and ▁opt ics ," ▁for ▁which ▁he ▁published ▁text books ▁in ▁various ▁ed itions . ▁ ▁Ma ior ▁proved ▁to ▁be ▁a ▁vision ary . ▁In ▁ 1 9 2 3 ▁he ▁invited ▁Hermann ▁Ober th ▁to ▁defend ▁his ▁dis sert ation ▁at ▁the ▁University ▁of ▁Cl uj , ▁after ▁it ▁had ▁been ▁rejected ▁by ▁the ▁University ▁of ▁Heidel berg ▁as ▁" to o ▁u top ian ." ▁ ▁He ▁put ▁his ▁signature ▁on ▁the ▁di pl oma ▁of ▁a ▁man ▁who ▁later ▁would ▁be ▁widely ▁recognized ▁as ▁the ▁father ▁of ▁modern ▁inter plan et ary ▁ro cket ry . ▁ ▁Dist in ctions ▁He ▁was ▁elected ▁a ▁member ▁of ▁the ▁Roman ian ▁Academy ▁of ▁Sciences ▁on ▁ 2 1 ▁December ▁ 1 9 3 7 . ▁ ▁Ma ior ▁founded ▁the