Mark Stacey founded the Aphelion Software Group, and works tirelessly to cross the business / technical boundaries in Business Intelligence, working in both SharePoint and SQL.
He has published 2 books on BI - Sharepoint 2010 BI and Visual Intelligence and frequently speaks at both SQL Saturday and SharePoint Saturday events. He is one of the few Microsoft PDW trainers, and has trained in Africa, India and Europe on the PDW, as well as all over the world on other technologies