Richardson is known his roles as Detective Matt Ryan in the crime drama City Homicide, which he played from 2007 until 2011, and as Gary Canning in the soap opera Neighbours from 2014 to 2020.

He has also appeared in a variety of Australian films and television shows, including Blue Heelers, McLeod's Daughters, Rogue, Conspiracy 365, and Wentworth.

[5] He studied political science and Australian cinema and theatre at Flinders University in Adelaide and from 1989 attended the Victorian College of the Arts, graduating in 1991[1][6] Richardson co-wrote The Belly Of The Whale with Luke Elliot, which was presented at the Melbourne Fringe Festival in 1996.

[9] Richardson had guest stints in several Australian television shows, including Neighbours as Kim White,[10] Blue Heelers,[11] Stingers,[12] and McLeod's Daughters as Tom Braiden.

[6] Richardson starred in the 2002 Australian crime film The Hard Word, alongside Guy Pearce and Joel Edgerton.

In 2023 during a rally which was attended by Liberal MP Renee Heath, Richardson spoke of standing up to the process of deracinating who we are as Australians.

[32] Deakin University researcher Gerard Gill called the emergence of the group as "arguably the most defined and deliberate far-right turn for Australian conspiracism".

[31] On 14 September 2024 the group met with various other far-right, white supremacist, and neo-Nazi identities such as Thomas Sewell, Blair Cottrell, and members of the National Socialist Network at an event in Melbourne to discuss "advocating for the rights of people of European descent".

[33] In November 2024, Victoria Police investigated Richardson after a film from a NWA gathering in September showed him raising his arm in a Nazi salute, which is banned in the state.