(1901 – 1974) Architect most controversial for breaking away from the international style in his designs of the 1950s. Born in the Russian Empire, Kahn designed workers’ housing and private residences in the 1930s and 1940s in the form of the international style. His mature works, including the Richards Medical Research Building (1960–5) in Philadelphia, PA and the Salk Institute for Biological Studies (1959–65) in La Jolla, California, attempted to look to history without reviving it in the creation of distinct “servant” and “served” spaces. This design technique made reference to both classical and medieval architecture, creating laboratories of architectural note for the first time.