Greg was appointed as President of the First-tier Tribunal (Tax Chamber) in October 2017. 

Greg was called to the Bar in 1981.  Between 1983 and 1987, Greg worked in the Solicitor’s Office of HM Customs and Excise.  He returned to private practice in 1988 with a firm of solicitors now known as Hogan Lovells International.  He was admitted as a solicitor in 1989 and became a partner in the tax group of the firm in 1993.

Greg was appointed as a salaried Judge of the Upper Tribunal, assigned to the Tax and Chancery Chamber, in February 2012 and regularly sat in the First-tier Tribunal as well.