- Mark is Portland's Partner for digital communications
- He has joined from Downing Street where he was head of strategic communications, working for the Labour and Coalition Governments
- He was Managing Director of LBC (Europe's biggest commercial newstalk radio station) from 2002 - 2005
- From 1998 - 2002, Mark was Operations Director of the media company Chrysalis Group plc where he was responsible for regional radio and online
- Before this, he worked as a journalist, DJ and manager in a variety of commercial radio stations around the UK