The long-time MIT architecture professor died in December 2020 at 94.

The architect died on March 4, 2021 at age 91. Over the years, his dwellings were featured in Record Houses at least 19 times.

Revered and beloved by the architects with whom he collaborated, Robertson, who died on February 11, may remain best known for engineering the Twin Towers of the World Trade Center (WTC) with architect Minoru Yamasaki.

The structural engineer died February 11, 2021, at the age of 92. Read tributes from Guy Nordenson, Jayne Merkel, Carol Willis, James von Klemperer, and Eric Höweler.

Leslie E. Robertson, preeminent structural engineer of supertall buildings, died on February 11—one day before his 93^rd birthday.

The designer died on December 22, 2020 at the age of 93.