Tom DeMeester, MD is the RefluxMD Medical Advisor and former Chairman of the USC Department of Surgery. He is world renowned for his work in foregut and esophageal diseases. He was instrumental in the development of esophageal testing modalities, including 24 hour esophageal pH monitoring, the scoring of which bears his name. Dr. DeMeester has revolutionized esophageal surgery and is considered one of the world authorities on GERD. He has over 470 publications in peer-reviewed journals, 170 book chapters, 9 books and several videos and motion pictures to his credit.