An early and continuing contributor to a wide spectrum of Open Source development projects, Mark is actively working on wide-scale deployments of Open Source technologies in a variety of environments, both private and public sector.

As CEO of Sirius Corporation, Mark has been instrumental in the adoption and roll out of Open Source at some of the largest corporations in Europe, including a growing number of companies running exclusively on Free Software end-to-end, server to desktop.

Mark was the founder of the Open Source Consortium (OSC) in the UK. The OSC comprises over 80 of the country's leading Open Source businesses. The OSC's purpose is to bring Open Source technologies to the UK Government and Public Sector.

A direct participant in some of the leading Enterprise Open Source projects, Mark is also a well known and authoritative writer and speaker on all aspects of the Open Source phenomenon.