David W. Chang, EdD, RRT, is professor of cardiorespiratory care at the University of South Alabama in Mobile, Alabama. Over the years, he has served in different capacities in the American Association for Respiratory Care, Commission on Accreditation for Respiratory Care, and National Board'for Respiratory Care. Dr. Chang has also authored Clinical Application of Mechanical Ventilation and co-authored Respiratory Critical Care.

Jonathan Waugh, PhD, RRT, RPFT, FAARC is a Professor for the Respiratory Therapy program at Liberty University in Lynchburg, Virginia. He received a BS in Respiratory Therapy from the Cardiopulmonary Sciences program at the University of Central Florida in 1985. He earned a master’s degree in health science (1990) and a PhD in cardiopulmonary sciences (1994) from the Ohio State University. He conducts research in ventilatory monitoring, capnography, high flow therapy, medical device testing, and tobacco prevention and treatment.