After reading Natural Sciences at Cambridge Mark did his articles at McKenna & Co. Mark joined Schilling & Lom in 1988, and became a Partner in 1992. He joined Carter-Ruck in 2002.

Mark specialises in all aspects of media law, including defamation, confidence, privacy and copyright and acts for both claimants and defendants. He also practices in the areas of copyright and passing off and does media regulatory work.

Mark is well known for acting for a number of high profile clients such as Jay Jopling, Marco Pierre White, Vodafone, Keira Knightley, Naomi Campbell, Kate Winslet, Simon le Bon, Lily Allen, Sienna Miller, Margaret McDonagh, Lord Sawyer, Ewan McGregor, Martin Sorrell, WPP, Michelle Collins, Jarvis, Tilda Swinton, Hugh Laurie and Michael Sheen. Mark also acts for a number of politicians.

Mark was involved in the landmark privacy cases of Campbell v MGN, Campbell v Frisbee and McKennitt v Ash.