On August 7, 2023, having just turned 74, Jean-Louis Cohen was enjoying lunch at his family’s vacation home in the Ardèche region of southern France when an angry wasp took his life. We suddenly lost the person who’s widely considered the most insightful, wide-ranging, lyrical, and prolific historian of modern architecture, a dazzling scholar and polymath, a man of immense joie de vivre, luminous and witty, boundless in his warmth and generosity, especially for students.