A forensic investigator of “sick buildings” and director of Harvard’s Healthy Buildings program teams up with a CEO-turned–Harvard Business School professor to reveal the secrets of a healthy building — and unlock one of the greatest business opportunities of our time.

By the time you reach 80, you will have spent 72 years of your life indoors. Like it or not, humans have become an indoor species. This means that the people who design, build and maintain our buildings can have a major impact on our health.