Gerrit Thomas Rietveld (Dutch, 1888–1964) was an architect and furniture designer closely associated with the De Stijl movement and the development of modernist design. Born in Utrecht, he trained as a cabinetmaker in his father’s workshop before opening his own furniture studio in 1917. That same year he designed the Red and Blue Chair, a radical piece that translated the abstract principles of De Stijl into three-dimensional form through the use of simple planes, primary colors, and intersecting lines. Rietveld later joined the De Stijl group, working alongside figures such as Theo van Doesburg and Piet Mondrian in the search for a new universal visual language. Expanding from furniture into architecture, he completed the Schröder House in Utrecht in 1924, a landmark of modern architecture that embodied the movement’s ideas of spatial flexibility and geometric clarity. Throughout his career, Rietveld continued to experiment with modular construction, affordable materials, and rational design. His work remains a cornerstone of modernist design history.