Robb first began running with Liverpool Harriers &amp; AC, a racing team based in Liverpool, at the age of 12. From the age of 17, he was coached by Ernie Gallagher, a former miler who had raced Roger Bannister in the 1950s. Robb made his Olympic debut in the men's 800 meters at the 1992 Summer Olympics, where he finished sixth overall. At the 1993 World Championships in Athletics, Robb raced in the men's 800 metres, where he was involved in a controversy after cutting in front of Johnny Gray, with Gray losing his step. In the men's 800 at the 1996 Summer Olympics, Robb made it to the semifinal round, but did not make it to the final round.