Willem Gillisz Kool (c. 1608-1609 – 1666)
• Was a Dutch Golden Age painter.
• He was born in Haarlem.
• Entered the Haarlem Guild of St. Luke in 1638.
• In the same year he married Cornelia van der Molen, daughter of Jan Gerritsen van der Molen, on 17 january 1638.
• He is known for landscapes and died in Haarlem.