The connection between health and productivity at work is intuitively obvious but has not been demonstrated to the satisfaction of either researchers or corporate financial officers. Ronald Kessler and Paul Stang help to bridge the usual gap between research and the marketplace with the help of a top-notch group of the best 'real-world' investigators obtainable-all in the cause of making the case that employee health should be treated as an investment in business performance-thus creating the new discipline of health and productivity management.