Joseph Allen Stein was an influential American architect who significantly contributed to regional modern architecture in the San Francisco Bay Area and later in India after moving there in 1952. He is recognized for integrating California modernism with Indian architectural traditions, emphasizing the relationship between buildings and their environment, utilizing local materials, and creating spaces that harmonize with nature. Notable works include the India International Centre and India Habitat Centre, both reflecting his philosophy of modern regionalism and consideration for ecological balance.