Dutch painter. He was the younger brother, assistant and close follower of Adriaen van der Werff. He imitated his brother's style closely and made many copies of his work. He is best known for his portraits. In the 1690s he painted a portrait of Czar Peter the Great (now in the Hermitage Museum of St. Petersburg). Many of his works - including a series of busts of the administrators of the Dutch East India Company (Vereenigde Oostindische Compagnie, VOC)- are now part of the collections of the Rijksmuseum in Amsterdam. //