Despite his primary focus on the clinical practice of gastroenterology, he has published extensively in the internal medicine/gastroenterology literature, contributing over 600 articles/chapters/invited reviews and abstracts in peer-reviewed journals and books. His particular areas of expertise focus on esophageal reflux disease, sleep disorders and colorectal screening. Additionally, he co-edited the American College of Physicians (ACP) book “Dyspepsia” and edited two GI Clinics of North America series on “Obesity Issues for Gastroenterologists” and edited the recent 2012 American College of Physicians module on CRC screening. He is editor of the 2015 book: The Gut Microbiome: New Understanding and Translational Opportunities for Disease as well as co-editor of the 2018 book: Sleep Effect on Gastrointestinal Health and Disease: Opportunities for Promoting Health and Optimizing Disease Management. He has co-authored 17 national guidelines for gastroenterology related disease.