Hungarian architectural partnership, also active in the USA, formed in 1938 by Aladár Olgyay (b Budapest, 1 Sept 1910; d Princeton, NJ, 1963) and Viktor Olgyay (b Budapest, 1 Sept 1910; d 22 April 1970). Twin sons of the painter Viktor Olgyay (1870–1929), the brothers completed their studies at the Technical University, Budapest, in 1934 and spent the following years in Europe and the USA. In 1938 they opened an office in Budapest, where their first significant plans derived from their experience of Italian urban architecture of the 1930s, as in their plan (unexecuted) to connect the remains of two ancient Roman amphitheatres in Budapest with a pedestrian way. A notable executed project is the residential block (1941), Városmajor Street, Budapest, which was dubbed the ‘reversed house’ as the living quarters opened on to the garden rather than the street. The garden façade reflects the influence of Le Corbusier, while the street façade, with loggia, is dominated by the stairwell’s glass, cylindrical, outward-curving roof, a feature that also appears in some of their earlier designs. Their largest building is the Stühmer Sweet Factory (1941), Budapest, the most advanced Hungarian factory building of its day. In it Olgyay & Olgyay found the most flexible architectural solution for the working requirements. As the building needed to be long, each level was given a series of two-tiered windows, which gave the façade a horizontal feel. The brothers also designed exhibition pavilions and plans for a ‘spaceless and timeless exhibition hall’, which was flexible enough to have various applications. After World War II they had a few years of intensive activity, before settling in 1948 in the USA, where they primarily worked on architectural theory, chiefly in the field of climatic design.