Ludwig Hilberseimer (1885–1967) was a German architect, urban planner, and theorist known for his radical ideas on modernist city planning. A key member of the Bauhaus school, he advocated for functional, organized urban layouts, as seen in his Vertical City concept, which prioritized efficiency, zoning, and public health. Forced to flee Nazi Germany, he relocated to the U.S. in 1938 and became a professor at the Illinois Institute of Technology. His collaboration with Mies van der Rohe influenced postwar urban planning, particularly in social housing projects. Hilberseimer’s theories continue to shape contemporary discourse on sustainable and human-centered city design.