Ludwig Mies van der Rohe was a pioneering German-American architect who helped define modern architecture. Some of his most notable works included the Barcelona Pavilion, Farnsworth House, 860-880 Lake Shore Apartments in Chicago, and S.R. Crown Hall. Mies strove to create open floor plans and harmonious balances between buildings and nature using new materials like steel and glass. He believed "less is more" and that form should follow function.