The 2004 World Junior champion, he has represented Canada at the 2008 & 2012 Summer Olympics, 2010 Commonwealth Games and the 2008 IAAF World Indoor Championships. His personal best for the event is 2.31 metres.
He won the IAAF World Junior Championships gold medal in 2004. From Nanoose Bay, British Columbia, Mason is only the second Canadian to win a World Junior Championship gold medal, following Mark Boswell who won in 1996. Mason holds a number of provincial records previously held by retired Canadian high jumper and 1976 Olympic Silver Medallist Greg Joy, including the BC high school, junior and senior records.
Following his world junior win, he set the current NAIA record and was the bronze medalist at the 2006 NACAC U-23 Championships. He jumped a personal best of 2.27 m to win the Canadian title in 2007 Canadian Senior Championships. He is a member of the Valley Royals Track and Field Club.
In 2008 Mason improved his personal best during the indoor season, to 2.30 in January in Seattle. At the 2008 World Indoor Championships he finished eighth. He made his Olympic debut a few months later at the 2008 Beijing Olympics and placed eighth in his qualifying group with a jump of 2.25 m, although he missed the final. Competing as a student-athlete, he took the silver medal in the high jump at the 2009 Summer Universiade. The year after he represented Canada at the 2010 Commonwealth Games with a seventh place finish in the final.
He cleared 2.31 m for the first time at the Baie-Mahault Grand Prix in Guadalupe, winning the event with a meet record mark.
