Dr. Moira M. W. Chan-Yeung has over 40 years of experience in research and scholarship, having published about 400 peer-reviewed articles, numerous book chapters and several books. A world authority on occupational asthma, she was instrumental in having it recognized as a compensable disease and setting up criteria for assessing respiratory impairment/ disability in patients with asthma. She was given the Alice Hamilton Award for ""Major and Lasting Contribution in Occupational Health"" from the American Industrial Hygiene Association and the prestigious Distinguished Achievement Award from the American Thoracic Society in recognition of her contributions. Moira M. W. Chan-Yeung is Professor Emeritus of Medicine at the University of British Columbia and Honorary Clinical Professor of Medicine at the University of Hong Kong. This book is her sixth work on history after her retirement.