Final answer:
Walter Gropius designed International Style buildings for the Bauhaus School, focusing on simplicity and the concept of 'less is more'.
Step-by-step explanation:
Walter Gropius was the architect who designed International Style buildings for the Bauhaus School. Gropius was the founder of the Bauhaus and designed the school's buildings to advance the art of modern architecture. His designs focused on simplicity and the concept of 'less is more'.
An example of his work is the Bauhaus building in Dessau, Germany, which features clean lines and functional design.