▁univers ities , ▁including ▁the ▁University ▁of ▁Chicago , ▁the ▁University ▁of ▁Illinois ▁and ▁the ▁University ▁of ▁Washington . ▁He ▁also ▁ad vised ▁the ▁British ▁Col onial ▁Office ▁on ▁constitution al ▁matters ▁and ▁ad vised ▁the ▁govern ments ▁of ▁Gh ana ▁and ▁Hong ▁Kong ▁on ▁legal ▁issues . ▁Among ▁many ▁other ▁works , ▁he ▁published ▁a ▁bi ography ▁of ▁Sir ▁Isaac ▁Isa acs , ▁the ▁first ▁Australian - born ▁and ▁first ▁Jewish ▁Governor - General ▁of ▁Australia . ▁ ▁Cow en ▁was ▁appointed ▁Vice - Ch an cell or ▁of ▁the ▁University ▁of ▁New ▁England ▁in ▁Ar mid ale , ▁New ▁South ▁Wales , ▁in ▁ 1 9 6 6 . ▁The ▁following ▁year , ▁he ▁produced ▁for ▁ABC ▁television ▁the ▁" Yes " ▁case ▁for ▁the ▁Australian ▁refer endum , ▁ 1 9 6 7 ▁( A bor iginal s ). ▁From ▁ 1 9 7 0 ▁to ▁ 1 9 7 7 ▁he ▁was ▁Vice - Ch an cell or ▁of ▁the ▁University ▁of ▁Queensland ▁in ▁Br is b ane , ▁during ▁the ▁difficult ▁years ▁of ▁the ▁Vietnam ▁War ▁and ▁Spring b ok ▁tour ▁student ▁protest s . ▁In ▁ 1 9 7 7 ▁Ray ▁Cro oke ▁painted ▁Port rait ▁of ▁Professor ▁Emer it us ▁Sir ▁Zel man ▁Cow en ▁which ▁is ▁part ▁of ▁the ▁University ▁of ▁Queensland ▁collection . ▁By ▁this ▁time ▁he ▁was ▁regarded ▁as ▁one ▁of ▁the ▁leading ▁constitution al ▁law y ers ▁in ▁the ▁English - spe aking ▁world . ▁He ▁was ▁Emer it us ▁Professor ▁of