Leslie E. Robertson, a brilliant conceptualist who designed the structural systems of the original World Trade Center in New York City, has died. The Distinguished Member was 92.
Robertson, P.E., S.E., Dist.M.ASCE, NAE, died one day before his 93rd birthday. He was world-renowned as an innovator for structures small to supertall. When he was director of the New York City office of the Seattle structural firm Skilling Helle Christiansen Robertson, he designed his first high-rise – the two record-tall Twin Towers of the WTC in lower Manhattan. After their completion in 1973, they stood as the tallest buildings
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