Ronnie Fass, MD, is the Medical Director of the Digestive Health Center, Chairman of the Division of Gastroenterology and Hepatology, and head of the Esophageal and Swallowing Program at the MetroHealth Medical Center, Cleveland Ohio. He is also a tenured professor of medicine at Case Western Reserve University. Dr. Fass did his internship and residency in internal medicine at the University of Arizona Health Sciences Center, where he later became a Chief Resident. He then completed a fellowship in gastroenterology at the University of California in Los Angeles where he focused on GI motility and functional bowel disorders.

Dr. Fass has served in leadership positions in many societies. He is the former treasurer of the American Neurogastroenterology and Motility Society as well as the chair of the education committee. The former member of the Nominating Committees of the Upper GI Section and Neurogastroenterology and Motility of the American Gastroenterological Association (AGA). He has served as the chair of the Functional Esophageal Disorders committee for Rome IV, Membership committee of the American Neurogastroenterology and Motility Society, Practice Parameter Committee and Audio Committee of the American College of Gastroenterology (ACG) and the Publication Committee of the American Society of Gastrointestinal Endoscopy (ASGE). He has also served as a member of the management committee of the journal Neurogastroenterology and Motility. Currently Dr. Fass serves as a member of the World Gastroenterology Organization (WGO) Guidelines and Publications committee, member of the ACG Digital communications and publications committee, member of The American Forgut Society (AFS) annual meeting planning committee and research committee, member of the International Society of Diseases of the esophagus (ISDE), education committee and the ACG GI on demand task force steering committee. In addition, Dr. Fass has served on the ANMS/EMS consensus group for Refractory GERD, as a core team member of Chicago Classification 4.0, The EndoFlip experts panel working group and he is the representative of the AFS on the multi-society guidelines for endoscopy credentialing. Moreover, Dr. Fass has served as a member of many committees in different GI societies.

Dr. Fass is the editor-in-chief of the Journal of Clinical Gastroenterology and he is the editor-in-chief of the Journal of Neurogastroenterology and Motility. Dr. Fass is a frequent lecturer and presenter and is a reviewer for more than 70 journals. He is and has served on the editorial board of 27 journals.

Dr. Fass is the recipient of the American Gastroenterological Association Award for Digestive Sciences in Clinical Research, the Southern Arizona VA Health Care System Investigator of the Year Award, and the International Foundation of Functional Gastrointestinal Disorders Senior Clinical Investigator Award. He has received the University of Arizona Dean’s Research Award, the Glaxo Institute of Digestive Health Clinical Research Award twice, the American College of Gastroenterology Research Award three times, the American Medical Association Resident-Mentor Award twice, and the American Journal of Gastroenterology Outstanding Reviewer Award. Dr. Fass has been selected as one of the Best Doctors in Arizona between 2004 and 2011, Best Doctor in Northern Ohio between 2012 and 2016, Castle Connolly Top Doctor from 2015-2021 and America’s Top Doctor in 2021. Dr. Fass was named World’s Leading Expert in the research and treatment of GERD (press release 11/2013) and World’s expert in esophageal motility disorders (Press release 7/2019) by Expertscape.com.

Dr. Fass has published more than 450 articles, editorials and commentaries in journals such as Gastroenterology, Gut, American Family Physician, American Journal of Gastroenterology and Archives of Internal Medicine. He has published three books and has written 62 book chapters, including 2 chapters in UpToDate.