Dr Paul O’Byrne, MB, is a distinguished university professor of medicine and dean and vice-president of the Faculty of Health Sciences at McMaster University. Acknowledged globally for his research on asthma. Author of numerous publications, including over 500 peer-reviewed papers in high-impact journals, including NEJM, Lancet, and Nature Medicine. Past chair of the Science Committee of the Global Initiative for Asthma (GINA). Editor in chief of the McMaster Textbook of Internal Medicine.