This book of essays celebrates Mark Aronson’s contribution to administrative law. As joint author of the leading Australian text on judicial review of administrative action, Aronson’s work is well-known to public lawyers throughout the common law world and this is reflected in the list of contributors from the US, Canada, Australia, New Zealand and the UK. The introduction comes from Justice Michael Kirby of the High Court of Australia. The essays reflect Aronson’s interests in judicial review, non-judicial grievance mechanisms, problems of proof and evidence, and the boundaries of public and private law. Amongst the contributors, Peter Cane, Elizabeth Fisher, and Linda Pearson write on administrative adjudication and decision-making, Anita Stuhmcke writes on Ombudsmen, and Robin Creyke and John McMillan, the Commonwealth Ombudsman, write on charters, codes and ‘soft law’. There are evaluations of the profound influence of human rights law on judicial review from the UK by Sir Jack Beatson and Thomas Poole and from Canada by David Mullan. Matthew Groves and Chief Justice James Spigelman address developing themes in judicial review, while Carol Harlow, Richard Rawlings, Michael Taggart and Janet McLean follow Aronson’s interests into the private side of public law. An American perspective is added by Alfred Aman and Jack Beermann.