He received instruction from Esaias van de Velde (1587–1630), and distinguished himself particularly in landscape and animal painting, though his historical works and battle pieces are also admired.

[1] Nicolaes de Helt Stockade and Asselijn married two sisters in Lyons in 1645, both daughters of Houwaart Koorman of Antwerp.

[4] He was one of the first Dutch painters who introduced a fresh and clear manner of painting landscapes in the style of Claude Lorraine,[2] and his example was speedily followed by other artists.

[6] Several inscriptions were added by later owners of the painting, including "Holland" on one of the eggs, and "Enemy of the state" next to the dog that is threatening the nest.

[8] Willem Schellinks' City Wall in the Winter was long thought to be Asselijn's, until the painting was restored and the original monogram was revealed.