[3] At the age of thirteen he joined the academy of London Irish and made his club debut in 2021.
[2] He scored a try in the semi-final of the 2021–22 Premiership Rugby Cup against Leicester Tigers and then started in the final as they finished runners up to Worcester Warriors.
[5] In May 2022 Joseph received his first call-up to the senior England squad by coach Eddie Jones for their tour of Australia.
[6] On 9 July 2022 he made his senior debut for England as a late substitute during their second test victory at Lang Park.
[7] He was an unused substitute for the final game as they beat Australia at Sydney Cricket Ground to win the series.