Mark Chaffin is Data Warehouse Architect for Encore Development (http://www.encoredev.com) and has developed numerous decision support systems for clients in such industries as technology, mortgage banking, retail, financial services and insurance. He also has experience in clickstream analytics, data mining, transactional application architecture, Internet application architecture, database administration and database design. He has completed a book about Data Transformation Services with Brian Knight (http://www.sqlservercentral.com/columnists/bknight).