He was called to the Bar of England and Wales to The Honourable Society of Middle Temple in 1993. He joined 5 Paper Buildings following the successful completion of pupillage. In 1998 he moved to Uganda, remaining as a door tenant in Chambers, to work with Mugerwa & Masembe, Advocates until 2003.

Mark was depicted in the recent ‘Responsible Child’ BBC Drama reconstruction in which, in the original trial, he appeared as lead counsel for the defence of the 14 year-old boy. Mark also appeared for the defendant in the ‘front page’ and nationally reported ‘bike boy’ case (R v Charlie Alliston).