Ludwig Mies van der Rohe was a pioneering German architect known for his maxim "less is more". Through his minimalist designs using steel and glass, he helped define modern architecture. Some of his most notable works include the Barcelona Pavilion, Farnsworth House, Seagram Building, and Toronto-Dominion Centre. Mies strove to create open, flexible floor plans and emphasized the structural elements of each building. He believed architecture should express the modern age through refined materials and spatial arrangements.