Oscar Niemeyer (December 15, 1907 – December 5, 2012), was a Brazilian architect considered to be one of the key figures in the development of modern architecture. Niemeyer was best known for his design of civic buildings for Brasília, a planned city that became Brazil's capital in 1960, as well as his collaboration with other architects on the headquarters of the United Nations in New York. His exploration of the aesthetic possibilities of reinforced concrete was highly influential in the late 20th and early 21st centuries.

His designs for the National Congress of Brazil, the Cathedral of Brasília, the Palácio da Alvorada, the Palácio do Planalto, and the Supreme Federal Court, all designed by 1960, were experimental and linked by common design elements. This work led to his appointment as inaugural head of architecture at the University of Brasília, as well as honorary membership of the American Institute of Architects. Due to his largely leftist ideology, and involvement with the Brazilian Communist Party (PCB), Niemeyer left the country and opened an office in Paris. He returned to Brazil in 1985 and was awarded the prestigious Pritzker Architecture Prize in 1988. He continued working at the end of the 20th and early 21st century, notably designing the Niterói Contemporary Art Museum (1996) and the Oscar Niemeyer Museum (2002). Over a career of 78 years, he designed approximately 600 projects, died in Rio de Janeiro on December 5, 2012, at the age of 104.

More Info: en.wikipedia.org