Starting out Mason began racing in the 250 Aprilia challenge before moving up to the British Supersport class in 2000.
British Supersport Championship (2000–2001) Mason competed in the Supersport class 2000 and 2001, earning his first podium finish (2nd) at the
Brands Hatch Indy circuit in the penultimate round of the 2000 season, overall Mason finished 8th in the Championship, 2001 saw Mason continue in the Supersport class, he finished the season in 7th after a consistent season.
British Superbike Championship (2002–2006) Between 2002 and 2006, Mason competed in the
British Superbike Championship, Mason struggled in his first season in the championship, retiring 12 times finishing 14th in the Championship. In 2003, Mason's form improved on the previous season, finishing 8th in the championship, having his career-high 4th-place finish on 3 occasions. Mason then finished 11th, 8th and 17th in the next three years of the championship.
AMA (2007–2008) Mason then moved to the AMA series for 2 years, but did not really make much of an impact in the Supersport or Superstock classes.
Return to the British Superbike Championship (2008–2012) Mason returned to the British Superbike championship in 2008 racing for the Quay Garage
Honda, competing in the privateers cup finishing 3rd in that championship, Mason was retained at the Quay Garage team for the 2009 the season in which he won the privateers cup. For 2010, Mason moved to the MSS Colchester
Kawasaki team, Mason has had mixed results in the 2010 season with a best finish of 7th place in the first race at
Oulton Park. For 2011 Mason stayed with the MSS Kawasaki squad, gaining his first ever full BSB podium in race one at Croft, a race which was full of incident with mixed weather conditions.
Endurance Racing (2013–2015) Mason joined Prime Factors Racing in the Endurance World Championship
Return to the British Superbike Championship (2016) Mason will return to BSB in 2016 with Prime Factors Racing & arc-on. ==Career statistics==