Van Harlem was one of the leading representatives of Dutch Mannerism. He was a pupil first of Pieter Pietersz, and then of Gillis Cogniet in Antwerp. In 1583 he returned to his native city, where he worked as a painter and an architect and helped found the local academy. Under the artistic influence of Jan van Hemesens and Bartholomaus Sprangers, Cornelis's paintings focused mostly on religious and mythological subjects, but also portraits and some hunting pieces. Typical of his style are representation of nude, muscular bodies and a strict observance of the laws of perspective. His early works often contain many figures, but later he reduced the number to only a few, allowing the background landscape to become more important. His significant works include. Haarlem Hunters' Dinner, 1583, The Slaughter of the Children in Bethlehem, 1591, The Marriage of Peleus and Thetis, 1593,