Legal career

Dr Cox was admitted and enrolled as a Barrister and Solicitor of the High Court of New Zealand 1988, admitted and enrolled as a Legal Practitioner of the Supreme Court of New South Wales 1999, admitted as a Barrister of the Supreme Court of Tasmania 1999, registered as a Practitioner of the Supreme Court of South Australia 1999, registered as a Legal Practitioner of the Supreme Court of the Northern Territory 2001, admitted as a Barrister and Solicitor of the Supreme Court of Victoria 2004, admitted as a Barrister of the Supreme Court of Queensland 2004, and registered as a Legal Practitioner of the Supreme Court of the Australian Capital Territory 2004. He was admitted as a Barrister-at-Law by the Honourable Society of the Inner Temple 2011.

He was also Convener of the Auckland District Law Society Public Issues Committee, and has commented in the media on legal matters, especially constitutional law questions.

In 2007 he was appointed a consultant by the World Bank to review the disciplinary processes for the Kenyan Bar.