Who was the architect and town planner of Islamabad?

Who was the architect and town planner of Islamabad?

اسلام آباد کا معمار اور ٹاؤن پلانر کون تھا؟
Explanation
Constantinos A. Doxiadis, often cited as C. A. Doxiadis, was a Greek architect and town planner.
He was known as the lead architect of Islamabad, the new capital of Pakistan in the 1960s, which concerns the science of human settlements.