Constantinos Apostolou Doxiadis was a prominent Greek architect and urban planner known for his role in designing Islamabad and developing the theory of ekistics, which focuses on the science of human settlements. His innovative planning concepts aimed to create cities that accommodate human needs while considering technological evolution and growth management. Doxiadis Associates, his firm, had a significant impact on urban development in over 40 countries and contributed to various notable projects including Aspra Spitia and the master plan for Islamabad.