Michael P. Devereux is Director of the Oxford University Centre for Business Taxation and Professor of Business Taxation at the University of Oxford. Alan J. Auerbach is Robert D. Burch Professor of Economics and Law at the University of California, Berkeley. Michael Keen is Deputy Director of the Fiscal Affairs Department of the International Monetary Fund. Paul Oosterhuis is Of Counsel, and was formerly Senior International Tax Partner, in the Washington DC office of Skadden, Arps, Slate, Meagher and Flom. Wolfgang Schoen is Managing Director of the Max Planck Institute for Tax Law and Public Finance in Munich. John Vella is Associate Professor of Tax Law at the University of Oxford and Assistant Director of the Oxford University Centre for Business Taxation.