▁at ▁the ▁Institute ▁was ▁reserved ▁for ▁him , ▁but ▁when ▁in ▁ 1 9 5 7 ▁he ▁returned ▁to ▁Dublin , ▁he ▁obtained ▁a ▁post ▁at ▁the ▁U pp s ala ▁University ▁to ▁teach ▁C elt ic ▁L anguages ▁and ▁Fol kl ore ▁( 1 9 5 7 – 1 9 5 9 ). ▁ ▁While ▁in ▁Re yk jav ik , ▁he ▁met ▁his ▁future ▁wife ▁Gu ð r ún ▁Hel ga ▁(' G im ma ') ▁Hall gr í ms d ó tt ir . ▁They ▁married ▁in ▁U pp s ala ▁in ▁ 1 9 5 9 ▁and ▁had ▁four ▁children . ▁ ▁Dublin ▁and ▁Gal way ▁Mac ▁E oin ▁returned ▁to ▁Ireland ▁in ▁ 1 9 5 9 ▁to ▁serve ▁as ▁Professor ▁of ▁Irish ▁at ▁St ▁Patrick ' s ▁College , ▁Dublin . ▁In ▁ 1 9 6 1 , ▁he ▁co - f ounded ▁Stud ia ▁Hi bern ica , ▁an ▁academic ▁journal ▁for ▁Irish ▁studies ▁published ▁by ▁the ▁College , ▁and ▁for ▁a ▁time ▁served ▁at ▁the ▁editor ial ▁board ▁( 1 9 6 1 – 1 9 6 5 ). ▁In ▁the ▁ 6 0 s , ▁he ▁also ▁became ▁President ▁of ▁Com har ▁na ▁M ú inte oir í ▁G ae il ge , ▁which ▁had ▁just ▁been ▁founded ▁to ▁promote ▁the ▁use ▁of ▁the ▁Irish ▁language ▁at ▁schools , ▁both ▁as ▁a ▁teaching ▁medium ▁and ▁a ▁subject ▁in ▁itself . ▁ ▁In ▁ 1 9 6 3 , ▁Mac ▁E oin ▁began ▁working ▁again