Rietveld is known particularly for two modernist classics — a chair and a house. Among de Stijl colleagues, Oud was a good friend (probably united by the impossibility of getting on for long with the dominating van Doesburg), while Mondrian and he probably never met, despite living quite close to one another. Van der Leck had been met through one of Rietveld’s architecture teachers. Rietveld was one of the founding members of an international forum initiated by Corbusier and Giedion, attending the first meeting with Stam and Chareau among others. Stam and Lissitzky together visited him at the Schröder House.