Prof Brian Farrell has resigned as chairman of the Arts Council, three years before his term was due to end.
Prof Farrell, who leaves his position next Wednesday after less than two years as chairman, will be replaced by Mr Patrick Murphy, a retired businessman and art collector.
In the 50-year history of the Arts Council this is only the second time that a chairperson has resigned mid-term. The RTE broadcaster and emeritus professor of politics at UCD was appointed chairman in June 1998.
The Minister for Arts, Ms de Valera, said she deeply regretted Prof Farrell's resignation. He had "said he wasn't able to continue giving 100 per cent and he didn't want to give anything less."
Prof Farrell said last night: "I have been enriched by my experience as chair, but my time constraints are such that I cannot commit myself to fulfilling the position in the way that will be required over the coming years."
The Irish Times reported last October that the Arts Council faced a threat of industrial action over the implementation of a three-year plan. After some weeks of speculation, the council declared "full support for the Arts Plan 1999-2001 and its implementation", as well as appreciation for "the professional commitment and integrity of the director and staff".
Asked on RTE Radio last night if his departure was linked to rows within the organisation, Prof Farrell said: "No. We did have troubles last year and I think that it was inevitable that we should have troubles." Implementing structural changes had led to "a level of tension" but most problems arose "from communications difficulties".
Mr Murphy retired as sales and marketing director of Minch Malt Ltd last month. He became chairman of ROSC in 1980 and of the Contemporary Irish Art Society since 1991. A member of the international council of the Museum of Modern Art in New York, he served on the Arts Council from 1982 to 1988.
On the problems which the council faced last winter, he said: "I think they're all put away. I'll certainly be making a special effort to see we have a harmonious and effective Arts Council at all levels. In the end, I'm a passionate believer in the pursuit of excellence."
The Arts Council is holding meetings next Monday and Tuesday and these will be chaired by Prof Farrell. Mr Murphy will then take over as chairman.