Lord Justice Lewis grew up in south Wales. He went to Cwmtawe Comprehensive School. He read law at Churchill College, Cambridge and then read for a Master’s degree at Dalhousie University, Nova Scotia Canada. He was an academic lawyer for many years before beginning practice. He was a Fellow in Law at Selwyn College and a University Lecturer in Law at Cambridge University.
He was called to the Bar in 1987 and began practice in 1992 principally in the field of judicial review and public law. He was on the Attorney General’s Panels of Junior Counsel to the Crown between 1996 to 2006. He was First Counsel to the Welsh Government between 2000 and 2013. He was appointed Queen’s Counsel in 2006. He was Chair of the Administrative Law Bar Association in 2010 and 2011. He became a Recorder in 2003 and was authorised to sit in the High Court in 2010. He was appointed to the High Court, Queen’s Bench Division (now King’s Bench Division) in 2013.
He was a Presiding Judge, Wales from 2016 to 2019. He was the Liaison Judge, Administrative Court in Wales from 2016 to 2017. He was the Deputy Chairman of the Boundary Commission for Wales from 2016 until 31 December 2019. He has written and contributed to books and journals and is the author of Judicial Remedies in Public Law (6th ed.). He is a Bencher of the Middle Temple.
He was appointed as a Lord Justice of Appeal in October 2020.