Anselm Eldergill qualified as a solicitor in 1987 and is an Honorary Professor of Mental Health Law at University College London.

He served as a full-time judge of the Court of Protection from 2010 to 2024 and before that as a tribunal president and coroner. While at the Court of Protection, he was the only Commonwealth judge appointed to be a member of the United Nations CRPD Expert Committee on Capacity and Access to Justice in Geneva.  In 2019, he was awarded the Legal Aid Lawyer of the Year Special Award, which was conferred on the President of the Family Division of the High Court the previous year:

His other roles have included serving as a member of the Mental Health Act Commission and as the legal member of the Mental Health Commission for Northern Ireland; chairing the Patient Safeguards and Mental Health Tribunal Legislative Reform Working Group, as part of the Wessely Review; and drafting the DoLS forms for the DHSC;  As a Mental Health Act Commissioner, he was head of complaints investigations and chaired its Mentally Disordered Offenders Committee.

He has lectured and trained lawyers and mental health professionals for over 35 years, both in the United Kingdom and abroad. His publications include numerous articles and conference papers and the following books:

Mental Health Review Tribunals — Law & Practice (Sweet & Maxwell, lxxvii, 1333 pages). Sold out and reprinted twice

Court of Protection Handbook (Co-author, LAG, London, 928pp, 2014,4th ed. 2022)

The European Court on Human Rights and Mental Health (1350 pages, September 2024).