[2] A Junior Kiwis and New Zealand Māori representative, Henry joined the Auckland Warriors in 1995, spending three years at the club without playing first grade.
[7] In 2012, he was appointed head coach of the Auckland Vulcans, the Warriors' New South Wales Cup feeder club.
[12] On 20 September 2020, Henry was announced as head coach of the New Zealand women's national rugby league team.
[14] In November 2022, Henry led the Kiwi Ferns to the final of the 2021 Women's Rugby League World Cup, which they lost to Australia 54–4.
[16] On 20 February 2024, Henry was appointed head coach of the North Queensland Cowboys Women's team, signing a three-year contract.