Ludwig Mies van der Rohe was a pioneering German-American architect known for his work in modernist architecture. Some of his most famous works include the Barcelona Pavilion (1929), Villa Tugendhat (1930), and Farnsworth House (1951). Mies believed that architecture should express the modern age through simplified forms and the use of new industrial materials like steel and glass. He strived to achieve a unified expression where every element of a building contributes to the overall design. Mies was influential in spreading the principles of the International Style and was known for his aphorisms "less is more" and "God is in the details."