Mass is a UK-based barrister with a multi-disciplinary practice that includes sports law. During his pupillage, he was exposed to a range of sporting matters in cases where his supervisors were representing clients which included Premier League football clubs and a Formula One racing team. Mass has since been instructed as sole counsel in sports cases before various Football Association (‘FA’) panels, including the FA Serious Case Panel and the FA Appeal Board.

Mass is an FA qualified football coach, and prior to joining the Bar, he worked as a football coach for a Premier League Football Club. He is a keen sportsman himself, and as such, he takes a wide interest in other sports, and sports law in general.