Brennan Spiegel, MD, MSHS is Professor of Medicine and Public Health and Director of Health Services Research at Cedars-Sinai Health System in Los Angeles, California. In addition to practicing general gastroenterology, he has a clinical and academic focus in irritable bowel syndrome, acid reflux disease, dyspepsia, and other functional gastrointestinal disorders. In addition to authoring the Acing series of Board review textbooks, Dr. Spiegel has published numerous book chapters, abstracts, editorials, and more than 130 articles in peer-reviewed journals. He serves on the Advisory Board of Editors for Clinical Gastroenterology and Hepatology and the Editorial Board for Alimentary Pharmacology & Therapeutics, and he is associate editor for the American Journal of Gastroenterology.

In addition to his focus on digestive disorders, Dr. Spiegel studies how digital innovations can improve the value of health care by strengthening patient-doctor bonds and bringing greater efficiency to the delivery of clinical services. His team of investigators at the Cedars-Sinai Center for Outcomes Research and Education (CS-CORE) seeks to transform the way patients, doctors, and hospitals communicate through wearable biosensors that track patients' vital signs and activities both in the hospital and at home, transmitting data to electronic medical records. His team develops computer programs and mobile health applications that allow patients to explain their medical histories online at home, saving time and providing up-to-date information for doctors. The team also explores social media and telemedicine as clinical communication tools.
Dr. Spiegel is a member of several professional organizations and is a fellow of the American College of Gastroenterology, the American Gastroenterological Association, and the Rome Foundation.