[3] He later attended St Joseph's College, Hunters Hill,[4] where he played in the 1st XV rugby team as a loose-head prop.

[5] After joining the Sydney University rugby club and making his debut in the Shute Shield, Robertson was selected to represent Australia at the 2014 IRB Junior World Championship hosted by New Zealand.

[1][6] Later that year he was chosen in the Sydney Stars squad to compete in the inaugural National Rugby Championship.

[1] Robertson began studying for a medical degree at Sydney University in 2016,[4] and also signed a contract with the NSW Waratahs for the 2016 season.

[8][9] In 2023, Robertson was awarded a John Monash Scholarship to undertake a Master of International Health and Tropical Medicine at Oxford University.