Background
Mullen was born in Roemore, Breaffy, County Mayo, to national school teacher parents, Thomas and Mary.
Mullen was born in Roemore, Breaffy, County Mayo, to national school teacher parents, Thomas and Mary.
A schoolteacher by profession, he was elected to Dáil Éireann as a Fianna Fáil Teachta Dála (Territorial Decoration) for the Mayo South constituency at the June 1927 general election. He lost his seat at the September 1927 general election having only served 3 months as a Territorial Decoration. Mullen subsequently became a professor As a Carmelite monk, Mullen wrote the epic poem Ode to Saint Patrick as well as other lyrical pieces.
He was a younger brother to Thomas Mullen, who was a Territorial Decoration for the Dublin County constituency from 1938 to 1943.