Which architect is recognized for the phrase "form follows function"?

The phrase "form follows function" is widely attributed to Louis Sullivan, who was an influential American architect in the late 19th and early 20th centuries. This concept emphasizes that the shape of a building or object should primarily relate to its intended function or purpose. Sullivan believed that rather than ornamentation dictating design, the practical needs of the building's use should inform its aesthetic appearance.

Sullivan's approach marked a significant departure from traditional architectural styles that prioritized decoration, promoting a philosophy that would become foundational in modern architecture. By prioritizing function, architects could create designs that reflected the true essence of the building's use, leading to more practical and efficient structures. His mantra became a guiding principle for many architects, influencing movements such as the Chicago School and later modernist architects who sought to integrate form and function seamlessly.

The other architects listed, while significant in their own right, did not explicitly define the relationship between form and function in the same way.