It is with great sadness that we announce the death of Djordje Mesarović on December 4, 2019 at Sunnybrook Hospital in Toronto, aged 86 years. As a young man, he survived the Second World War; relentlessly passionate and resilient, he went on to study architecture, achieving a doctorate from the Moscow State University of Civil Engineering, and becoming a tenured professor back home at the University of Sarajevo. A lifelong learner and teacher, he adored good brandy, good wine, and good seafood. A proud Canadian, he arrived in Toronto in 1996 and made the city home. A dedicated man with an enormous heart, he always had a story to tell and love to give. A tireless scholar, he could always be found with a physics book and a four-dimensional cube in his hands, explaining the nature of the universe to those who took the time to listen. One of his books is in the Library of Congress among other prestigious libraries, and we are so, so very proud of him. He loved immeasurably his wife, his children, and his grandchildren, and will always be remembered as a family man who never stopped ensuring the happiness and well-being of others.