Josep Lluis Sert was an architect from Barcelona, Spain. He was known for designing some of the world's most famous skyscrapers and buildings. To build his structures, he used a style of architecture called "modernism" which focused on creating buildings with a more simple, clean look. He wanted to create structures that respected the environment, so he used natural materials like stone, brick, and wood in his designs. He was also an advocate for social and economic justice and wanted to make sure his buildings were accessible to everyone. Josep Lluis Sert's legacy still lives on today in places like the United Nations building in New York City and several famous skyscrapers in world cities.