Lady Arden was a Justice of the Supreme Court of the United Kingdom from October 2018 to January 2022. From 2000 to 2018 she was a judge of the Court of Appeal of England and Wales. Lady Arden was also the Head of International Judicial Relations for England and Wales (2005-2018), responsible for liaison with leading courts across the world. She chaired the Judges' Council Working Party on Constitutional Reform (2004-2006).
Lady Arden is also a Member of the Permanent Court of Arbitration in The Hague and an ad hoc judge of the European Court of Human Rights in Strasbourg. She has held a number of other public appointments, including Chair of the Law Commission of England and Wales (1996-1999), and member of the Steering Group of the Company Law Review established by the Department of Trade and Industry (1998-2001). Lady Arden has written and lectured on a wide range of legal subjects. She was called to the Bar in 1971 (QC 1986) and appointed a High Court judge in 1993, the first woman judge to be assigned to the Chancery Division.