Mark is the co-founder of online monitoring and response specialist Market Sentinel.

Since Market Sentinel was founded in 2004, Mark has worked with customers including Yahoo! Europe, British Gas, the BBC Trust, Hyundai, Avis, GSK, Bacardi, Cadbury and Experian, helping them to understand web-based commentary, measure its relevance and respond to it using a variety of technical and editorial tools.

Previously Mark was co-founding commissioning editor BBC Online and co-founder Amazon.com Anywhere. He has worked for a number of high technology start-ups in the US and Europe. Publications include: "Search is Brand" (June 2005) and "Measuring the influence of bloggers" (December 2005), "Responding to crisis using social media" (April 2007).