Ouellet began took up athletics in 2011 at college. In 2013 he was selected to represent Canada at the 2013 World Championships in Lyon in the 1500 metres race, finishing fourth. Two years later he was back in the Canadian team to compete at his second World Championships, this time in Doha. He competed in both the 1,500m and 5,000m, winning gold in the latter, with a time of 15:07.64.