Joseph G. Allen is an associate professor at the Harvard T.H. Chan School of Public Health and director of Harvard’s Healthy Buildings Program. He is the co-author with John Macomber of Healthy Buildings: How Indoor Spaces Drive Performance and Productivity (Harvard University Press, 2020), which was recognised as a ‘Best Book of the Year’ by the New York Times and Fortune magazine. During the COVID-19 pandemic, Dr Allen served as commissioner of The Lancet COVID-19 Commission and chair of its Safe Work, Safe Schools, and Safe Travel Task Force. He began his career conducting forensic health investigations of sick buildings in several hundred buildings across a diverse range of industries, including healthcare, biotechnology, education, commercial office real estate and manufacturing. His work has been featured widely in the popular press, including the Wall Street Journal, Harvard Business Review, National Geographic, Time, NPR, Newsweek, The Washington Post, Fortune and The New York Times.