He took the Warriors to another Finals series in 2003, the same year he replaced Gary Freeman as head coach of the New Zealand national rugby league team.
In August 2006, St Helens won the Rugby League Challenge Cup after beating Huddersfield Giants 42–12 at Twickenham in the final.
In August 2008 Anderson won the Rugby League Challenge Cup with St Helens for a third successive year beating Hull FC 28–16 at Wembley Stadium.
[citation needed] In 2014, a report revealed that a review was conducted in order to determine whether Anderson should have been granted a contract extension as head coach back in 2011.
Anderson "had suggested his position would be untenable for the 2011 season and the level of undermining and the resultant instability would make his job impossible", the report read.
"[7] In 2016, Anderson along with four other board members were de-registered by The NRL and had their contracts terminated by Parramatta in the wake of the club's salary cap scandal.
[8][9][10] It was alleged that Anderson along with the other board members which the media dubbed "The gang of five" had been aware of or made payments to players outside of the game's rules.
Before Anderson was allowed to join the club, the Eastern Suburbs outfit had to convince the NRL that he was a fit and proper person befitting registration.
[14] On August 18, 2023, Go Media Mt Smart Stadium was named in his honour as a fundraiser for One NZ Warriors' final home game of the 2023 NRL regular season against Manly Sea Eagles.