He debuted for the Crusaders in Super Rugby in 2021 and has become a regular, reaching his 50th appearance in 2025. AccoladesWilliams was part of Crusaders teams that won Super Rugby titles in consecutive seasons around 2022-2023. He contributed to Māori All Blacks and All Blacks XV successes, including a win over Ireland A. Selection for the All Blacks and participation in the 2023 Rugby World Cup represent major international milestones. His long-term contract extension through 2029 underscores his value to New Zealand rugby.