He returned to academia, as Professor of Irish at University College Dublin, where one of his students was future Attorney General of Ireland, Chief Justice of Ireland and President of Ireland, Cearbhall Ó Dálaigh.
A revenit în mediul universitar, ca profesor de irlandeză la University College Dublin, unde i-a fost student, printre alții, viitorul procuror general și președinte al Irlandei, Cearbhall Ó Dálaigh.