Dutch-born Wim Rietveld (1924-1985) was an industrial furniture designer. He studied Industrial Design at The Hague Academy in 1950, before becoming head of design at Gispen in 1953. 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 was known for his functionalist chairs, tables and storage systems, but he also designed agricultural machinery, boats and trains. Alongside his design work, Wim Rietveld also lectured at the Royal Academy and the Technical University in Delft. Together with Ahrend, HAY has reproduced the Result Chair and Pyramid Table series.