Gerrit Rietveld (1888–1964) was a Dutch architect and designer best known for his role in De Stijl, an avant-garde movement that emphasized geometric abstraction and primary colors. His masterpiece, the Rietveld Schröder House (1924), is a seminal work of modernist architecture, featuring flexible, open-plan interiors and a revolutionary use of planes and lines. Rietveld also designed iconic furniture, including the Red and Blue Chair, which embodied De Stijl’s radical simplicity. His experimental approach influenced modern design, prefabrication, and spatial composition, leaving a lasting impact on 20th-century architecture and industrial design.