The attribution to de Keyser has been confirmed, on the basis of photographs, by Dr. Ann Jensen Adams (private communication with the owner, dated 16 March 2016), who will be including the portrait in her forthcoming monograph on the artist. She notes the treatment of the facial features are consistent with the signed Portrait of three Children and a Man of 1622 (Amsterdam, Rijksmuseum, inv. no. SK-A-1545), and that the technique is comparable with Portrait of a Dark-Haired Man Aged 58 of 1631 (Amsterdam Museum, inv. no. SA-7355). She therefore concludes that this panel was executed between late 1622 and 1631.