In 2012, Joseph made his professional debut, defeating Dean Garmonsway by technical knockout in the second round. Over the next four years, Parker remained undefeated in 21 fights, defeating notable challengers such as Frans Botha, Marcelo Luiz Nascimento Sherman Williams and Carlos Takam.
In December 2016, Joseph became New Zealand’s first ever World Heavyweight Champion, defeating Andy Ruiz Junior at Auckland’s Vector Arena to claim the vacant WBO World Heavyweight Championship.
Following his win over Ruiz, Joseph sucessfully defended his title against Razvan Cojanu, before his fight on British soil saw him defeat Hughie Fury in Manchester.
This victory paved the way for a unification bout with Anthony Joshua. Joseph lost on points but gained thousands of fans for his lionhearted and skilful display in Cardiff.
A second loss followed in late 2018 to Dillian Whyte, however Joseph bounced back strongly with a powerful KO win over Alexander Flores.
Recently Joseph has been producing fun videos that have been popular all around the world