Ralph Kimball

Ralph Kimball is an author on the subject of data warehousing and business intelligence. He is one of the original architects of data warehousing and is known for long-term convictions that data warehouses must be designed to be understandable and fast. His bottom-up methodology, also known as dimensional modeling or the Kimball methodology, is one of the two main data warehousing methodologies alongside Bill Inmon.
He is the principal author of the best-selling books The Data Warehouse Toolkit, The Data Warehouse Lifecycle Toolkit, The Data Warehouse ETL Toolkit and The Kimball Group Reader, published by Wiley and Sons.