I was called to the Bar in 1978 and became a Queen’s Counsel in 1994. I was appointed as a High Court Judge on 21 November 2002, assigned to the Queen’s Bench Division. I was elected to serve as one of the 18 judges of the International Criminal Court (“ICC”) in 2003 for a term of nine years and was assigned to the Trial Division. I served as President of the Trial Division. Until I presided over the Lubanga Case (the ICC’s first trial) in 2005, I continued working as a High Court judge, during which period I tried the 21/7 failed London bombers. I served a nine-year term at the ICC.I was appointed as a Lord Justice of Appeal on 10 May 2013 and I served as the Senior Presiding Judge from 1 January 2016 until 31 March 2017.On 27 February 2017, I was appointed as the first Investigatory Powers Commissioner, providing judicial oversight of the use of investigatory powers by public authorities. I was appointed as Vice President of the Court of Appeal Criminal Division on 20 October 2019. I was (re)appointed on 16 January 2023 as a judge of the Court of Appeal, sitting in retirement. On 1 July 2023, I was appointed as the Chair of the Security Vetting Appeals Panel. I sit on the Courts of Appeal of Guernsey, Jersey and Gibraltar. On 1 November 2024, I became Chair of the IEP (the disciplinary body for Members of the House of Commons).