We are grateful to Dr. Rudi Ekkart for confirming both the attribution and the identification of the sitter on the basis of photographs. He points out that Van Bleijswijk was a pharmacist from Delft who was a member of a family of Delft Regents and a younger son of a Burgomaster of the city. In 1645 he married Haesken van Crombrugghe who died five years later. In 1651 he embarked on a second marriage to Catharina van Well (1628-1722), both of whom sat to the Gorinchem painter Gerard van Kuijl (1604-1673) for the portraits now in the Rijksmuseum, Amsterdam (inv.A3861-2; formerly attributed to Gysbert van der Kuyl).
Maes depicts van Bleijswijk in the artist's preferred half-length format, hand on hip, soberly dressed in black, against a neutral background, in a manner that conforms fully to his portrait style of circa 1670. This is one of Maes's largest single figure portraits from the period lending the sitter a particularly authoritative air - an effect that is further enhanced by a slightly lowered view point and the man's dominance of the picture space.