Dutch-born Wim Rietveld studied Industrial Design at The Hague Academy in 1950, before becoming head of design at Gispen. In 1958, he started working at De Cirkel, a manufacturer of steel furniture that had merged with the Ahrend group in 1939. Here he met Friso Kramer, and together they developed a number of iconic design collaborations, including the Result Chair in 1958. Rietveld also designed the Pyramid Tables and Chairs for Ahrend in 1960. Rietveld is known for his functionalist chairs, tables, and storage systems, but he also designed agricultural machinery, boats, and trains, and was a frequent speaker at the Royal Academy and the Technical University in Delft. Together with Ahrend, HAY has reproduced the Result Chair and Pyramid Table series.