Mark has been a journalist for almost 20 years. He was Foreign Affairs Correspondent, Washington Correspondent and news anchor for RTE, the Irish national broadcaster. He left RTE in December 2009 to set up the social news agency, Storyful, which extracts news from the social media noise. Storyful discovers, verifies and delivers the most valuable and authentic content on social media platforms and works with some of the world's leading news brands.

Mark won the TV Journalist of the Year award in 2001 for his reporting from Afghanistan. He is the author of three books about US and world affairs and documentaries about Islam and American politics. His last position at RTE was presenter of the current affairs show Prime Time.