He competed for Guyana in the 110 metres hurdles at the 2000 Summer Olympics, and still holds the Guyanese record in that event. By the time of the 2002 Commonwealth Games, Allen was again representing Canada.
At the 2004 Summer Olympics, Allen made the finals in the 110 m hurdles after setting a new personal best time in each of the qualifying rounds.[2] He finished a respectable sixth, but in a slower time than he had hoped. He was also captain of Canada's 4 × 100 m relay team, but the team failed to pass the qualifying stages. At the 2006 Commonwealth Games in Melbourne, however, Allen won a bronze medal with the Canadian relay team.
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