Oscar Niemeyer was a Brazilian architect and a key figure in the development of modern architecture in Brazil. He is widely regarded as one of the greatest architects of the 20th century and was a pioneer of the modernist movement.

Niemeyer's work is characterized by a fluid, organic style that incorporates curves, sweeping lines, and exaggerated shapes into his designs. He was known for his use of reinforced concrete, and for his innovative approach to building design. Some of Niemeyer's most famous works include the United Nations headquarters in New York, the National Congress of Brazil in Brasília, and the Niterói Contemporary Art Museum. Niemeyer's work has had a lasting impact on the field of architecture.