Tomás is Assistant Secretary General at the Department of Education with responsibility for Reform, Evaluation, Policy and Statistics.
He was formerly the CEO of Teaching Council Ireland - the statutory professional standards body for teaching - overseeing a register of over 109,000 teachers - largest profession in Ireland.
Tomás served as Head of Irish Department, Froebel College of Education, 2000-2005 and as Chair of College's Academic Council from 2002-2005. He was also Syllabus and teaching resource designer for UCD (Diploma in Applied Irish), Gael Linn (2000-2001) and Froebel College of Education (2000-2005).
Tomás was a teacher of Irish, History and Mathematics at Athlone Community College from 1999 to 2000, having previously taught at Coláiste Ó Direáin, Inis Mór, Galway from 1997 to 2002.
Tomás has chaired and served on a number of committees:
- Southern Co-Chair of SCOTENS (Standing Committee on Teacher Education North South) February 2013 - October 2016
- NCCA Council member 2006-2009 (National Council for Curriculum and Assessment)
- Chair of NCCA Primary Languages Committee 2009
- Chair of Steering Group on Immersion Education Policy on behalf of Foras na Gaeilge 2006 - 2009, which agreed the first all-island Irish immersion education policy between 7 different groups on the island of Ireland including Departments of Education, North and South (observers).