Seán Ó Cuirreáin announced this evening that he is resigning from his role as Irish Language Commissioner.
Mr Ó Cuirreáin said he was concerned about the State's lack of commitment to the protection of Irish speakers' rights.
The former deputy head of Radio na Gaeltachta said that he felt he was left with no other choice but to resign from his position.
Mr Ó Cuirreáin was the first person to be appointed to the role of An Coimisnéir Teangain in 2004.
Part of his remit was to ensure the implementation of Irish language legislation.
His resignation is due to take effect in February.