Fazlur Rahman Khan (Bengali: ফজলুর রহমান খান, Fozlur Rôhman Khan) (3 April 1929 – 27 March 1982) was a Bangladeshi-American structural engineer and architect, who initiated structural systems that form the basis of tall building construction today. Considered the Father of tubular designs for high-rises, Khan became an icon in both architecture and structural engineering. He is the designer of Willis Tower – the tallest building in the United States (and tallest in the world for many years) and John Hancock Centre, a 100-story tall building. He also designed structures that are not high rises such as the Hajj Terminal and helped in initiating the widespread usage of computers for structural engineering. Khan, more than any other individual, ushered in a renaissance in skyscraper constructi