Srinivasa “Hal” Iyengar, an eminent structural engineer known for innovative solutions for difficult projects, such as the Guggenheim Bilbao Museum in Spain, died July 4 in Fort Myers, Fla., after a battle with Parkinson’s and heart disease. He was 85 years old.

Wind engineering pioneer Jon A. Peterka died May 21 in Fort Collins, Colo. He was five days shy of his 78^th birthday.

I. M. Pei, the Chinese-born American architect who designed iconic landmarks around the world, died this week in New York City at the age of 102.

Structural engineer Vincent J. DeSimone—an innovator with an outsize personality known for his ability to creatively support his architect-clients as they curved, twisted and stretched their building envelopes—died on Nov. 16, just two weeks shy of his 79th birthday.