Leslie E. Robertson, structural engineer of the World Trade Center, passes away at 92 – The Architect’s Newspaper

Acclaimed structural engineer Leslie Earl Les Robertson passed away following a fight with blood cancer at his home in San Mateo, California, on February 11, a day short of his 93rd birthday.

A native of Manhattan Beach in Los Angeles County, Robertson was a towering figure in his respective profession, lending an unfailingly innovative hand to a number of majorand often superlatively tallprojects across the globe including the U.S. Steel Tower in Pittsburgh (Philip Johnson), the Bank of China Tower in Hong Kong (I.M. Pei), Madrids Puerta de Europa towers (Johnson and John Burgee), the Shanghai World Financial Center (Kohn Pedersen Fox), and the Meyerson Symphony Center in Dallas (Pei). However, Robertsons first high-rise commission, the original World Trade Center towers, remains his defining project.

Robertson worked closely with architect Minoru Yamasaki on the project and pioneered several engineering firsts in the construction and design of the mid-century Manhattan mega-project. As detailed in a tribute from Leslie E. Robertson and Associations (LERA), where he served as founder and former partner, these innovations including the first use of a space-frame megastructure and outrigger for a high-rise building (also later used at the U.S. Steel Tower); the first use of prefabricated multi-column and spandrel-wall panels to allow column-free interior spaces and resist lateral force generated by hurricane winds, and the creation of mechanical damping units to reduce building sway in heavy winds.

Robertson got his start as a young structural engineer in the early 1950s after graduating from the University of California, Berkeley, with a bachelor of science. A thirty-something-year-old Robertson later found himself in Seattlehometown and home base of Yamasakiunder the employ of structural and civil engineering firm Worthington & Skilling. Design work kicked off the World Trade Center several years later with Robertsons firmthen Worthington, Skilling, Helle, and Jackson (WSHJ) and later Skilling, Helle, Christiansen, and Robertson (SHCR) after Robertson was made a partner in 1967leading the engineering side. SHCR later evolved into Seattle-based Magnusson Klemencic Associates after Robertson split the practices New York City office in the early 1980s and founded what today is LERA. Construction on the World Trade Centers emblematic twin towers at a record-setting 1,368 and 1,362 feet tall above Lower Manhattan, began in 1968 (the North Tower) and 1969 (the South Tower).

Despite his early personal and professional connections to the West Coast, Robertson lived and worked in New York for most of his life, beginning in 1963 when he relocated there to work on the World Trade Center. Per a tribute published by Engineering News-Record, he had only returned to California late last year.

Both a Member of the National Academy of Engineering and a Distinguished Member of the American Society of Civil Engineers, Robertson was bestowed with a multitude of awards and accolades over his long and prolific career. Those include the Mayors Award for Excellence in Science and Technology for his structural design of the World Trade Center as well as a World Trade Center Individual Exceptional Service Medal for his work in the reconstruction of the twin towers following a 1993 terrorist bombing. Other industry recognitions (and there are many) include a 1989 Award of Excellence (then Constructions Man of the Year Award) from Engineering News-Record, the Henry C. Turner Prize for Innovation in Construction Technology from the National Building Museum (2002), and a John Fritz Medal from the American Association of Engineering Societies (2012). He was received honorary degrees from several prestigious universities and served on the boards of a range of organizations including New York Citys Skyscraper Museum and the Architectural League of New York.

From 1985 through 1990, Robertson alsoserved as chairman of the Chicago-based Council on Tall Buildings & Urban Habitat (CTBUH). Its fair to say that there was likely not a more-liked Chairman, or someone with more longevity of involvement, than Les. To say he will be missed is, quite literally, a towering understatement, said, Antony Wood, CEO of CTBUH, in a tribute posted on the nonprofits website.

In 2001, Robertson was presented with the American Institute of Steel Construction (AISC)s J. Lloyd Kimbrough Award, an honor named after the organizations first president. Recognizing the pinacle of steel designers, Robertson is only one of three people to receive the award since 2000.

Les had such a cordial influence on others, including for me personally, said Charles J. Carter, SE, PE, PhD, president of the AISC, in a statement provided to AN. I first met him as an undergraduate student when he agreed to meet for a morning to discuss his recently completed Bank of China building. He made the whole concept of the building lateral system clear to me (as a student!) in about 20 minutes with just a few sketches and a brilliantly simple physical experiment that proved he found a creative way to eliminate column bending.

Weve lost a giant whose work will continue to speak volumes for generations to come, Carter added.

Robertsons revolutionary work on the World Trade Centerand how he had been haunted by the catastrophic events of September 11, 2001was the subject of an intimate feature-length documentary titled Leaning Out. Co-directed by Basia and Leonard Myszynski, the film premiered at the 2018 Architecture & Design Film Festival in New York.

Numerous tributes and obituaries published since Robertsons death have painted him as a devout pacifist and anti-war activist who active in the group Architects/Designers/Planners for Social Responsibility.

My sense of grief and my belief that I could have done better continue to haunt me, he wrote in a passage from his 2017 memoir, The Structure of Design: An Engineers Extraordinary Life in Architecture, shared by the New York Times in its obituary.Perhaps, had the two towers been able to survive the events of 9/11, President Bush would not have been able to project our country into war. Perhaps, the lives of countless of our military men and women would not have been lost. Perhaps countless trillions of dollars would not have been wasted on war. Just perhaps, I could have continued my passage into and through old age, comfortably, without a troubled heart.

Robertson leaves behind a wife, fellow structural engineer and former LERA partner SawTeen See, as well as children and grandchildren.

Following this remembrance, AN plans to publish a more in-depth look at Robertsons remarkable life and career in the coming days.

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Leslie E. Robertson, structural engineer of the World Trade Center, passes away at 92 - The Architect's Newspaper

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