"I have decided not to proceed with my secondment as Professor of Public Health Leadership and Strategy, Trinity College Dublin. I intend to retire as CMO with effect from 1 July to allow the Department of Health sufficient time to advance the process of appointing my successor.

"I do not wish to see the controversy of the last few days continuing. In particular, I wish to avoid any further unnecessary distraction that this has caused to our senior politicians and civil servants.

"My strong belief is that this was a significant opportunity to work with the university sector to develop much needed public health capacity and leadership for the future. In this regard, I would like to thank Trinity College and the Provost for their foresight and support in establishing this role.

"Following my departure, I look forward to sharing my knowledge and expertise outside of the public service.Following my departure, I look forward to sharing my knowledge and expertise outside of the public service."