Tom McDonnell: You can find an interesting paper on optimal top marginal tax rates here. The authors find that the optimal top marginal tax rate converges to about 2/3. You can read a synopsis of the findings here.
Tom McDonnell is senior economist at the NERI and is responsible for among other things, NERI's analysis of the Republic of Ireland economy including risks, trends and forecasts. He specialises in economic growth theory, the economics of innovation, the Irish and European economies, and fiscal policy. He previously worked as an economist at TASC and before that was a lecturer in economics at NUI Galway and at DCU. He has also taught at Maynooth University.
Tom obtained his PhD in economics from NUI Galway.