Gastroenterologist Mouen Khashab specializes in therapeutic endoscopy, and he oversees this group of practitioners across the Johns Hopkins enterprise. Nationally and internationally known in the field of interventional endoscopy, Dr. Khashab has contributed immensely to the field’s advancement as a minimally invasive means to treat gastrointestinal and pancreaticobiliary disorders. Dr. Khashab earned his medical degree from the American University of Beirut Faculty of Medicine, and subsequently completed a residency in internal medicine and a fellowship in gastroenterology at Indiana University. He then completed a two-year fellowship at The Johns Hopkins Hospital before joining the faculty in 2011. A busy researcher, Dr. Khashab has published more than 600 papers in peer-reviewed journals. In 2013, he described the procedure called gastric peroral endoscopic myotomy (known as G-POEM) and was able to disseminate and teach it all over the world. Other procedures that he expanded include peroral endoscopic myotomy (POEM), peroral endoscopic myotomy with fundoplication (POEM-F), Zenker’s peroral endoscopic myotomy (Z-POEM) and full thickness resection. In 2022, he received the Master Endoscopist Award from the American Society for Gastrointestinal Endoscopy (ASGE) for his numerous contributions to the field. His procedural expertise includes endoscopic retrograde cholangiopancreatography (ERCP), endoscopic ultrasound (EUS), interventional EUS, submucosal endoscopy, POEM/achalasia, endoscopic mucosal resection, endoscopic submucosal dissection, luminal stenting, large polyp resection and Barrett’s therapy, among others. Dr. Khashab is involved with multiple gastrointestinal societies and has served on many committees, including the ASGE Standards of Practice Committee, which is in charge of formulating guidelines for the practice of endoscopy. He has also served as an associate editor for the journal Endoscopy, a premier journal in the field. Khashab is a highly sought-after speaker at national and international conferences, and he has participated in multiple live endoscopy conferences. Outside of academic medicine, Dr. Khashab is an entrepreneur. His major interest is in new technology and medical devices, and his goal is to disrupt the field by introducing technology that makes endoscopic procedures safer, easier, efficient and more scalable. Dr. Khashab is highly rated in 52 conditions, according to our data. His top areas of expertise are Achalasia, Pancreatic Pseudocyst, Bile Duct Obstruction, Endoscopy, and Gastric Bypass.

Gastroenterologist Saowanee Ngamruengphong specializes in the endoscopic diagnosis and management of gastrointestinal malignancies, premalignant and malignant lesions in the gastrointestinal tract (e.g., early gastric cancer, Barrett's esophagus-associated neoplasia), esophageal cancer, colon polyps or early colorectal cancer, and pancreatic and biliary disease. Dr. Ngamruengphong earned a medical degree from Chulalongkorn University and completed residency training at the Texas Tech University Health Sciences Center. She undertook fellowship training in gastroenterology at the Mayo School of Graduate Medical Education and further fellowship training in therapeutic endoscopy at The Johns Hopkins Hospital. Her research interests include endoscopic resection and the management of precancerous or cancerous gastrointestinal lesions. Dr. Ngamruengphong is a member of several professional organizations, including the Thai Medical Council, the American College of Gastroenterology and the American Gastroenterological Association. Videos Endoscopic Submucosal Dissection (ESD) — Eileen’s Story Recent News Articles and Media Coverage A Rare, Stomach-Saving Endoscopic Procedure, Inside Tract (Spring 2021) Case Presentation: ESD-TAMIS, Inside Tract (Spring 2019) Innovative Approaches to Colorectal Surgery Benefit Patients, Surgery (Winter 2019) For Colorectal Polyps: Early Detection and Minimally Invasive Endoscopic Resection, Inside Tract (Winter, 2019) The Cutting Edge of Endoscopic Resection, Inside Tract (Spring, 2017) Stomach Cancer: Know Your Risks & Treatment Options, Johns Hopkins Surgery (4/26/2017). Dr. Ngamruengphong is highly rated in 41 conditions, according to our data. Her top areas of expertise are Achalasia, Pancreatic Pseudocyst, Stomach Cancer, Endoscopy, and Gastric Bypass.

Joseph Lin is a Gastroenterologist in Rosedale, Maryland. Dr. Lin is highly rated in 19 conditions, according to our data. His top areas of expertise are Attenuated Familial Adenomatous Polyposis, Juvenile Polyposis Syndrome, Cronkhite-Canada Disease, and Lactose Intolerance.

Saleh Alqahtani is a Gastroenterologist in Baltimore, Maryland. Dr. Alqahtani is highly rated in 12 conditions, according to our data. His top areas of expertise are Non-Alcoholic Fatty Liver Disease, Obesity, Hepatitis, Liver Transplant, and Hepato-Pancreato-Biliary Surgery. Dr. Alqahtani is currently accepting new patients.

Francis Giardiello is a Gastroenterologist in Baltimore, Maryland. Dr. Giardiello is highly rated in 10 conditions, according to our data. His top areas of expertise are Familial Adenomatous Polyposis, Juvenile Polyposis Syndrome, Attenuated Familial Adenomatous Polyposis, Colonoscopy, and Endoscopy.

Geoffrey Nguyen is a Gastroenterologist in Baltimore, Maryland. Dr. Nguyen is highly rated in 9 conditions, according to our data. His top areas of expertise are Viral Gastroenteritis, Ulcerative Colitis, Hemorrhagic Proctocolitis, Endoscopy, and Colonoscopy.

Dr. Akshintala received his medical degree from the Andhra Medical College in India in 2011. Following this, he completed a post-doctoral research fellowship in Gastroenterology at Johns Hopkins Hospital where he established himself as a dedicated researcher. Dr. Akshintala completed his internship and residency training in Internal Medicine at the University of Pittsburgh Medical Center in 2016. He completed his fellowship in Gastroenterology at Johns Hopkins Hospital in 2019. Dr. Akshintala then completed additional fellowships in Advanced Endoscopy and Medical Pancreatology at the Johns Hopkins Hospital in 2021. As of July 1, 2021, Dr. Akshintala is an Assistant Professor of Medicine in the Division of Gastroenterology at Johns Hopkins Hospital. Dr. Akshintala’s research is focused on the medical as well as endoscopic evaluation and treatment of inflammatory disorders of the pancreas. He is also interested in developing new devices and technologies for the care of patients with gastrointestinal disorders. Dr. Akshintala has conducted multi-national randomized-controlled trials and has won numerous awards at major national and international conferences for his research. He also has authored more than 60 original articles, editorials, book chapters and review articles. Dr. Akshintala has received grant funding from the American Society for Gastrointestinal Endoscopy (ASGE) and the Maryland State to support his research. As an innovator, Dr. Akshintala has patented new therapies for gastrointestinal bleeding and pancreas necrosis, a complication of acute pancreatitis. An internationally recognized researcher conducting multi-national clinical trials, Dr. Akshintala holds an Adjunct Assistant Professor position at the Asian Institute of Gastroenterology in India, one of the largest gastroenterology hospitals in the world. Dr. Akshintala is a Ph.D. candidate with the Dutch Pancreatitis Study Group in the Netherlands, who have been pioneered landmark clinical trials related to pancreatitis. Dr. Akshintala offers in-person clinic visits at the Baltimore location and also provides telemedicine visits for patients located in Maryland, Washington, D.C. and Virginia. Dr. Akshintala is highly rated in 8 conditions, according to our data. His top areas of expertise are Hereditary Pancreatitis, Acute Pancreatitis, Chronic Pancreatitis, Endoscopy, and Lithotripsy.

Mark Donowitz is a Gastroenterologist in Baltimore, Maryland. Dr. Donowitz is highly rated in 7 conditions, according to our data. His top areas of expertise are Diarrhea, Crohn's Disease, Short Bowel Syndrome, and Small Bowel Bacterial Overgrowth. Dr. Donowitz is currently accepting new patients.

Dr. Bulat joins Johns Hopkins from Tulane University, where he was director of the neurogastroenterology and motility service and director of the GI training program. He specializes in motility and functional disorders, with an emphasis on gastroparesis. He completed his master’s degree (neuroscience) and doctorate (physiology and pharmacology) in the area of smooth muscle function, as well as motility subspecialty training, at McMaster University. Dr. Bulat is an accomplished researcher and has authored several publications and book chapters in his field of interest. Dr. Bulat is highly rated in 5 conditions, according to our data. His top areas of expertise are Gastroparesis, Gastric Dysmotility, Morning Sickness, Gastrectomy, and Endoscopy.

Dr. Stephen J. Meltzer is a Professor of Medicine and Oncology at Johns Hopkins University, Division of Gastroenterology. He is the Director of GI Early Detection Biomarkers Laboratory and a member of the Johns Hopkins Kimmel Cancer Center. His research interests are Gastrointestinal cancer and precancer biomarker discover, development and validation; genomics, epigenomics and bioinformatics, early detection of cancer, outcomes research in cancer and precancer, risk stratification prediction in cancer and precancer, Barrett's esophagus, inflammatory bowel disease-associated cancer, liver cancer and gastric cancer. After receiving degree in Medicine at the State University of New York Medical School, Dr. Meltzer interned at Tulane University in New Orleans and University of Texas Medical Branch in Galveston, TX. He completed his fellowship training program in the University of Colorado and the Lenox Hill Hospital. He was an Assistant Professor in UCLA, Center for Health Science in 1987. Prior to joining the faculty at Johns Hopkins in 2006, he was Professor of Medicine and Pharmacology, Founder and Head of Aero digestive Cancer/Biomarker Program in School of Medicine, University of Maryland at Baltimore. He is an Associate Editor of Cancer Research and a member of the editorial board of Esophageal. He has published 152 original scientific papers in high-impact scientific journals. He also has 43 chapters, review articles, editorials, or letters to the editor; 1 book; and 139 abstracts to his name. He has given a plethora of invited lectures around the world, all involving his principal field of esophageal and gastrointestinal cancer research. He has been the recipient of numerous prestigious national and international awards, including the Robert and Sally D. Funderburg Award in Gastric Cancer Biology and membership in the American Society for Clinical Investigation. Special Interests: Gastrointestinal cancer and precancer biomarker discover, development and validation; genomics, epigenomics and bioinformatics, early detection of cancer, outcomes research in cancer and precancer, risk stratification prediction in cancer and precancer. Barrett's esophagus, inflammatory bowel disease-associated cancer, liver cancer, gastric cancer. Dr. Meltzer is highly rated in 4 conditions, according to our data. His top areas of expertise are Barrett Esophagus, Esophageal Cancer, Stomach Cancer, Colorectal Cancer, and Endoscopy.

Kimberly Gudzune is a Gastroenterologist in Baltimore, Maryland. Dr. Gudzune is highly rated in 1 condition, according to our data. Her top area of expertise is Obesity. Dr. Gudzune is currently accepting new patients.

Raymond Cross is a Gastroenterologist in Baltimore, Maryland. Dr. Cross is highly rated in 10 conditions, according to our data. His top areas of expertise are Crohn's Disease, Ulcerative Colitis, Viral Gastroenteritis, Endoscopy, and Colonoscopy.

Iris Lee is a Gastroenterologist in Baltimore, Maryland. Dr. Lee is highly rated in 33 conditions, according to our data. Her top areas of expertise are Bile Duct Obstruction, Familial Pancreatic Cancer, Childhood Volvulus, Endoscopy, and Colonoscopy.

Paul Thuluvath is a Gastroenterologist in Lutherville, Maryland. Dr. Thuluvath is highly rated in 32 conditions, according to our data. His top areas of expertise are Liver Failure, Hepatitis, Hepatitis C, Liver Transplant, and Endoscopy.

Jahangir Khan is a Gastroenterologist in Rosedale, Maryland. Dr. Khan is highly rated in 19 conditions, according to our data. His top areas of expertise are Gastroesophageal Reflux Disease (GERD), Barrett Esophagus, Gastric Dysmotility, and Juvenile Polyposis Syndrome.

Anthony Kalloo is a professor of medicine with special interests in natural orifice translumenal endoscopic surgery, therapeutic endoscopy and sphincter of Oddi dysfunction. After receiving his medical degree at the University of the West Indies Medical School, Dr. Kalloo interned at Port of Spain General Hospital in Trinidad and performed his internal medicine residency at Howard University Hospital in Washington, D.C., where he was also chief resident. He completed fellowship training at the combined Georgetown University, Veterans Affairs Medical Center and National Institutes of Health program. Dr. Kalloo was an instructor of medicine at Georgetown University prior to joining the Johns Hopkins faculty in 1988. He was director of the Johns Hopkins Division of Gastroenterology and Hepatology from 2005–2020, and was an associate editor of Gastrointestinal Endoscopy. In 2009, Dr. Kalloo was recognized by the American Society for Gastrointestinal Endoscopy as the Distinguished Educator of the Year. In 2014, he received the Endoscopy Award from the German Society for Endoscopy for outstanding research and contribution in the field of endoscopy. In 2015, he received the BJ Vakil Oration from the Society of Gastrointestinal Endoscopy of India, which is bestowed on an international expert for his contribution to the field of gastrointestinal endoscopy. He has authored over 200 peer-reviewed publications and has more than 100 patents, including the use of botulinum toxin in the gastrointestinal tract, endoscopic cryotherapy and the winged biliary/pancreatic stent, as well as others related to natural orifice surgery. He is the pioneer of natural orifice translumenal endoscopic surgery, a technique that will enable abdominal surgery without the use of incisions. In 2015, he became a member of the inaugural chapter of the National Academy of Inventors at The Johns Hopkins University. This group represents the top 3% of all faculty inventors since 1969, and the top 1.5% of active Johns Hopkins faculty. Dr. Kalloo is a past panel chair for gastroenterology and urology devices with the United States Food and Drug Administration. He aims to advance the understanding, diagnosis, treatment and prevention of gastrointestinal and liver disease through patient care, education and research. Dr. Kalloo is highly rated in 14 conditions, according to our data. His top areas of expertise are Hereditary Pancreatitis, Acute Pancreatitis, Achalasia, Endoscopy, and Gastrectomy.

Bruce Greenwald is a Gastroenterologist in Baltimore, Maryland. Dr. Greenwald is highly rated in 11 conditions, according to our data. His top areas of expertise are Barrett Esophagus, Esophageal Cancer, Benign Esophageal Stricture, Endoscopy, and Colonoscopy.

Dr. Bull-Henry joins Johns Hopkins as a hospitalist specializing in small bowel imaging, including single balloon enteroscopy, double balloon enteroscopy and wireless video capsule endoscopy. In addition, she has a special interest in small bowel GI bleeding, innovation in medical education and the use of artificial intelligence to attain greater diagnostic efficiencies, to improve patient outcomes and to achieve cost savings. Dr. Bull-Henry is active in her research. She has also published papers, contributed to book chapters and written abstracts on related clinical topics. Dr. Bull-Henry is active in a number of professional societies and currently serves on the Board of Governors and as Chair of the Training Committee for the American College of Gastroenterology. Videos Double Balloon EnteroscopyFAQ with Dr. Bull-Henry. Dr. Bull is highly rated in 6 conditions, according to our data. Her top areas of expertise are Angiodysplasia of the Colon, Gastroparesis, Painful Swallowing, Endoscopy, and Colonoscopy.

Mary Harris is a Gastroenterologist in Baltimore, Maryland. Dr. Harris is highly rated in 5 conditions, according to our data. Her top areas of expertise are Crohn's Disease, Ulcerative Colitis, Hemorrhagic Proctocolitis, and Colitis. Dr. Harris is currently accepting new patients.

Jean-pierre Raufman is a Gastroenterologist in Baltimore, Maryland. Dr. Raufman is highly rated in 4 conditions, according to our data. His top areas of expertise are Bile Acid Malabsorption, Colorectal Cancer, Diarrhea, Liver Transplant, and Colonoscopy.

Esteban Mezey is a Gastroenterologist in Baltimore, Maryland. Dr. Mezey is highly rated in 3 conditions, according to our data. His top areas of expertise are Hepatitis C, Hepatitis, Congenital Hepatic Fibrosis, and Cholangiocarcinoma (Bile Duct Cancer).

Anita Sivaraman is a Gastroenterologist in Baltimore, Maryland. Her top areas of expertise are Gastrointestinal Bleeding, Colitis, Viral Gastroenteritis, Colonoscopy, and Endoscopy. Dr. Sivaraman is currently accepting new patients.

Niraj Jani is a Gastroenterologist in Baltimore, Maryland. Dr. Jani is highly rated in 45 conditions, according to our data. His top areas of expertise are Acute Pancreatitis, Gastroesophageal Reflux Disease (GERD), Choledocholithiasis, Endoscopy, and Colonoscopy.

Jamie Walters is a Gastroenterologist in Towson, Maryland. Dr. Walters is highly rated in 41 conditions, according to our data. Her top areas of expertise are Irritable Bowel Syndrome (IBS), Gastroesophageal Reflux Disease (GERD), Chronic Erosive Gastritis, Gastrectomy, and Endoscopy.

Peter Darwin is a Gastroenterologist in Baltimore, Maryland. Dr. Darwin is highly rated in 27 conditions, according to our data. His top areas of expertise are Cholestasis, Bile Duct Obstruction, Bile Duct Stricture, Endoscopy, and Pancreatectomy.