Brett graduated from the University of Auckland in 1999 and was admitted to the New Zealand bar that year. In 2001 he was admitted as a solicitor in New South Wales, Australia and in 2005 as a solicitor of the Supreme Court of England and Wales.

Brett is a commercial litigator with a large book of liability and security enforcement claims liquidations, bankruptcies and some defamation claims.

Brett regularly acts for creditors in defended matters and appears in the Weathertight Homes Tribunal, District Court and High Court.

In 2014 he was appointed a senior associate of the firm.