(b Amsterdam, 4 May 1884; d Paris, 15 July 1970). Dutch collector and art historian, one of the most renowned of all connoisseurs of Old Master drawings and prints. He was self-taught and pursued an independent career, working a good deal as an agent and adviser for other collectors. His main field of interest was Dutch and Flemish art of the 16th and 17th centuries, Rembrandt being his favourite artist. He was an extremely industrious scholar, his most notable publications being Les Marques de collections de dessins et d'estampes (1921, supplement 1956), a fundamental reference work on collectors and the marks they used to identify their drawings and prints, and Répertoire des catalogues de ventes publiques (3 vols., 1938–64; a 4th volume appeared posthumously in 1987), which lists tens of thousands of art sale catalogues from c.1600 to 1925. During the Second World War he lived in the USA and he spent his final years in Paris, where in 1953 he established a cultural foundation, the Institut Néerlandais, to house his own superb collection; it opened in 1957.
From The Oxford Dictionary of Art in Oxford Reference.