is an Assistant Professor at the and Impact Director of the . He is also a Research Fellow at the . His work focuses on issues of tax compliance and tax design, including taxation at the top of the income distribution and the taxation of 'non-doms', as well as taxation issues in low income countries. His work has been quoted across the media, including the FT, Times, Economist, Telegraph, Guardian, Sun, and Mirror. His work on measurement of the UK's "Tax Gap" has also been cited by HMRC and by the Office for Statistics Regulation.