Mark Hill was amongst those selected in 2009 for appointment as Queen's Counsel. He specializes in ecclesiastical law and is regularly retained in Consistory Courts, the Court of Arches and various Ecclesiastical Tribunals as well as in the secular courts on religious matters and the law of the Church of England in particular.

He sits as a Recorder in the Crown Court and the County Court on the Midland Circuit. He has represented clergy in proceedings under the Clergy Discipline Measure 2003 and has been retained in a Provincial Inquiry into Pastoral Breakdown under the Incumbents (Vacation of Benefices) Measure 1977, and in an appeal before the Provincial Synod of the Church in Wales.

He regularly accepts instructions funded by ecclesiastical legal aid administered by the Legal Aid Commission of the General Synod of the Church of England. His practice also includes chancel repair liability, church property, faculty jurisdiction, charitable trusts, and local government law as it affects the Church of England.

With a particular interest in religious liberty and human rights, he has been instructed in the European Court of Human Rights, the House of Lords, and the Court of Appeal as well as in the High Court and County Court. Since 2002, Mark Hill QC has been editor of the Ecclesiastical Law Journal. He is the author of Ecclesiastical Law, the leading textbook on the subject, now in its third edition (2007), and co-editor of English Canon Law (1998). He was editor of a volume of essays Religious Liberty and Human Rights (2002) and is a Member of the International Advisory Board of the Revista General de Derecho Canónico y Derecho Eclesiástico del Estado. He is currently working on a monograph on Religion Law in the United Kingdom commissioned for the International Encyclopaedia of Laws, which will be published in 2010, and preparing the ecclesiastical entries for the forthcoming third edition of Jowitt's Dictionary of English Law.

Chancellor of the Diocese of Chichester since 1999, of the Diocese of Gibraltar in Europe since 2004 and Deputy Chancellor of the Diocese of York since 2007, Mark Hill QC has been a member of the Legal Advisory Commission of the General Synod of the Church of England since 2001 and holds a Masters degree in Canon Law from the University of Wales. He is a Visiting Fellow of Emmanuel College, Cambridge a nd Honorary Professor of Law at the Centre for Law and Religion in Cardiff University.

Mark Hill QC is a regular contributor to the Church Times and an occasional guest on BBC Radio 4's Law in Action programme. He lectures extensively in the United Kingdom, Europe and the USA as well as contributing to leading legal periodicals, most recently an article on headscarves and religious dress published in Public Law. He is a member of the European Consortium for Church and State Research, and Convener of the United Kingdom Inter-Faith Legal Advisers Network.