[2] In 2006 at the age of thirteen he moved with his father to England where he attended Gillotts School and excelled at rugby union after taking up the sport.
[3][4] In 2014 Hepburn requested that Wasps coach Dai Young release him from his club contract and he returned to his native Perth in an attempt to pursue a Super Rugby career.
[18] Hepburn was a member of the 2018 tour of South Africa but did not play in any of the games featuring only as an unused substitute in the Dead rubber third test as England lost the series 2-1.
[21][22] Their final fixture of the year on 24 November 2018 saw Hepburn make his sixth and last appearance for England in a victory over the nation of his birth Australia.
[1][12] On 3 February 2024 he made his debut for Scotland as a second-half substitute in their opening round victory against Wales at the Millennium Stadium.