Ralph Kimball is known worldwide as an innovator, writer, educator, speaker and consultant in the field of data warehousing. His books on data warehousing and dimensional design techniques have become the all-time best sellers in data warehousing. Margy Ross is President of DecisionWorks Consulting and a Ralph Kimball Associate. She has focused exclusively on decision support and data warehousing since 1982. Bob Becker has worked to implement large-scale decision support and data warehousing systems since 1990. Bob teaches Kimball University on-site courses. Joy Mundy has focused on data warehousing and business intelligence since the early 1990s, specializing in business requirements analysis, dimensional modeling, and business intelligence systems architecture. Warren Thornthwaite has been building decision support and data warehousing systems since 1980.