As a teenager, he was DJ'ing for friends at parties, and he eventually graduated to the club world, becoming a resident at Electronation. He toured extensively in Asia and Europe, and in 2006 landed a U.K. (and Continental Europe, for that matter) hit single with the track "Exceeder." He was also a violin player, and his skills were such that he played with Tiësto. In 2009, Mason launched his own label, , and released several double A-side singles including "Front Row Chemistry" and "The Amsterdam Tapes." In 2011, he released the album They Are Among Us, featuring guest performances by such artist as Kurtis Blow, Sway, Sam Sparro, and Róisín Murphy. The album Zoa followed in 2014, including collaborations with a.o. Jocelyn Brown. Further success came in 2015 when he released the single "Fashion Killa (Papapapa)" through , and the track rose to number one on the electronic music-oriented store Betaport. In 2016, he officially signed to and began working with Azealia Banks. Following some homophobic comments that Azealia Banks made on Twitter, Mason broke ties with the rapper and began work with U.K. grime artists Stefflon Don, who were featured on the "Fashion Killa (Papapapa)" single. In 2016, he mixed and compiled the Toolroom Miami Poolside album. In 2017 his single ‘Rhino’ became the ‘hottest record of the world’ by BBC Radio 1