Jan Pieterszoon Sweelinck was a Dutch composer, organist, and pedagogue whose work straddled the end of the Renaissance and beginning of the Baroque eras. He was among the first major keyboard composers of Europe, and his work as a teacher helped establish the north German organ tradition.
The above text from the Wikipedia article "Jan Pieterszoon Sweelinck" text is available under CC BY-SA 3.0.