. Dr. Handy is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Spinocerebellar Ataxia Type 12, Spinocerebellar Ataxia Type 15, Spinocerebellar Ataxia Type 8, and Spinocerebellar Ataxia Type 10.

Dr. Brett Parker is a general surgeon and fellowship-trained minimally invasive foregut and bariatric surgeon. He is an Assistant Professor of Surgery at Johns Hopkins and also the Program Director for the Johns Hopkins Advanced GI and Minimally Invasive Surgery Fellowship Program. Dr. Parker is an expert in minimally invasive surgical techniques including advanced laparoscopy and robotic surgery, as well as therapeutic flexible endoscopy. He is interested in promoting the evolving indications for surgical repair of hiatal hernias, as well as adjunct procedures surgeons can use to reduce recurrence rates. He offers a wide range of interventions for GERD, including innovative endoscopic therapies, and promotes early surgical referral to discuss and tailor therapy to individual patient circumstances. Dr. Parker also has a robust abdominal wall reconstruction and weight loss surgery practice. He is widely published on the surgical outcomes of foregut surgery, emerging technologies, and innovation, as well as surgical simulation and skills transfer. Dr. Parker has consistently been selected as a Washingtonian Magazine Top Doctor in 2023, 2024, and 2025. As a member of the Johns Hopkins Division of Minimally Invasive Surgery in the Greater Washington Area, Dr. Parker is dedicated to the best, individualized, patient outcomes. Learn more about Dr. Parker and his partners within the Johns Hopkins Division of Minimally Invasive Surgery, the Johns Hopkins Heartburn Center and the Johns Hopkins Motility and Neurogastroenterology Center. Dr. Parker is rated as an Advanced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Hiatal Hernia, Hernia, Congenital Diaphragmatic Hernia, Endoscopy, and Gallbladder Removal.

Olaya Gutierrez is a Gastroenterologist in Washington, Washington, D.c.. Dr. Gutierrez is rated as an Advanced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Achalasia, Gastroesophageal Reflux Disease (GERD), Choledocholithiasis, Endoscopy, and Lithotripsy.

Antoinette Saddler, M.D., is a fellowship-trained gastroenterologist specializing in general gastroenterology and management of patients with mild to severe malnutrition. She has experience in treating complex gastrointestinal disorders including short bowel syndrome, celiac disease, inflammatory bowel disease, irritable bowel syndrome, gastrointestinal malignancies, gastrointestinal tract dysmotility and high-output ostomies, as well as the malnutrition associated with these conditions. Dr. Saddler has held positions at the University of Kentucky, MedStar Washington Hospital Center, the University of Virginia School of Medicine, and the George Washington University School of Medicine and Health Sciences. She has also been a private practice gastroenterologist. Her professional activities include regional and national lectures on the management of gastrointestinal disorders associated with malnutrition. She previously served as the director of medical nutrition at the University of Virginia Digestive Health Center, where patients with complex gastrointestinal and nutritional disorders receive care. Dr. Saddler obtained her medical degree at the Case Western Reserve University School of Medicine. She completed her residency training in internal medicine at New York-Presbyterian/Weill Cornell Medical Center followed by fellowship training in gastroenterology at Memorial Sloan Kettering Cancer Center. She pursued additional fellowship training there in clinical nutrition. Dr. Saddler is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Gastroparesis, Chronic Erosive Gastritis, Familial Adenomatous Polyposis, Endoscopy, and Gastrectomy.

Pradeep Gupta is a Gastroenterologist in Arlington, Virginia. Dr. Gupta is rated as a Distinguished provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Attenuated Familial Adenomatous Polyposis, Juvenile Polyposis Syndrome, Cronkhite-Canada Disease, Endoscopy, and Colonoscopy.

Diego Kuperschmit is a Gastroenterologist in Arlington, Virginia. Dr. Kuperschmit is rated as a Distinguished provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Familial Adenomatous Polyposis, Gastric Dysmotility, Gardner Syndrome, Endoscopy, and Pancreatectomy.

A Washington-area native, Dr. Erica R. Cohen is a highly-accomplished physician. She is a trained Inflammatory Bowel Disease specialist which gives her unique expertise in Crohn's disease, ulcerative colitis, microscopic colitis, and refractory c. difficile colitis infection. In addition, she treats a wide range of concerns such as celiac disease, colon cancer screening, and diverticular disease. Dr. Cohen is rated as an Advanced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Diverticular Disease, Crohn's Disease, Ulcerative Colitis, Viral Gastroenteritis, and Endoscopy.

Dr. Jessica D. Korman is a gastroenterologist affiliated with Suburban Hospital. She practices out of Capital Digestive Care’s Metropolitan Gastroenterology Group in Washington, D.C. and Bethesda, Md. Dr. Korman has an expertise in colorectal cancer screening, as well as anal cancer screening and prevention. Dr. Korman earned her undergraduate degree from the University of Rochester and her medical degree from the Mount Sinai School of Medicine, where she conducted research with the division of liver diseases. She completed a residency in internal medicine at Montefiore Medical Center, where she also completed a fellowship in gastroenterology and was recognized by the Leo M. Davidoff Society for Outstanding Achievement in the Teaching of Medical Students. Dr. Korman also earned the Dr. Marcel Zimetbaum Complete Physician Award by the division of gastroenterology at Montefiore Medical Center. Dr. Korman is a member of the American College of Gastroenterology, the American Gastroenterological Association and the American Society for Gastrointestinal Endoscopy. Dr. Korman has been repeatedly named a Top MD in Washingtonian Magazine. Dr. Korman is rated as an Advanced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Colonic Malakoplakia, Diarrhea, Trichohepatoenteric Syndrome, and Irritable Bowel Syndrome (IBS).

Otolaryngologist Vaninder “Vinny” K. Dhillon specializes in endocrine surgery, laryngology, otolaryngology, parathyroid diseases and surgery, swallowing disorders, thyroid diseases and surgery, and voice problems. She treats both children and adults. After earning her medical degree from Keck School of Medicine of the University of Southern California, Dr. Dhillon completed a residency in otolaryngology at Los Angeles County and University of Southern California Medical Center. Dr. Dhillon’s research interests include the role of voice outcomes in patients after thyroid and parathyroid surgery when there is concern for vocal fold weakness or paralysis, evaluation of the role of office-based treatment on vocal fold paralysis, as well as neurogenic recovery of vocal fold paralysis. Dr. Dhillon is also interested in treatments for neurogenic chronic cough, which is refractory to other medical intervention. Dr. Dhillon is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Laryngeal Nerve Damage, Spasmodic Dysphonia, Neurofibromatosis Type 2 (NF2), Thyroidectomy, and Parathyroidectomy.

Christopher Duke, MD is a second-generation physician and native Washingtonian. His parents practiced medicine in Washington for four decades. Chris has practiced internal medicine here for 30 years. He attended George Washington University for his undergraduate and medical degrees. He completed Internal Medicine training at Penn State University. Chris practices evidence-based medicine while emphasizing empathy for his patients and their families. He personally knows and refers patients to the many outstanding specialists in Washington. He is excited to team with his patients to optimize their health and enjoyment of life. He has taught medical students at George Washington as an associate professor of medicine. He has been recognized by Washingtonian Magazine as a “Top Doctor” including in 2022. Outside of work, he enjoys traveling with wife Lilian and children Jacqueline and James. He loves attending Notre Dame football games and spoiling his pugs- Mini and Rockne! LinkedIn https://www.linkedin.com/in/christopher-duke-md-1126314. Dr. Duke is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Rabson-Mendenhall Syndrome, Vitamin B12 Deficiency, Subacute Combined Degeneration, and Cellulitis.

Dr. Drew Jung is an assistant professor of surgery in the Johns Hopkins Department of Surgery. He is an expert in minimally invasive surgery whose clinical focus is in laparoscopic and robotic surgeries. He has specialties in open and laparoscopic hernias, bariatrics, foregut, and quality improvement as it pertains to quality of care. Dr. Jung is focused on being able to get patients back on their feet sooner and have the potential to get back to work sooner than before. He is open to accepting all new patients to provide his expertise. Videos Dr. Andrew Jung M.D Bio Video. Dr. Jung is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Hernia, Hemolytic Transfusion Reaction, Low Blood Pressure, Sleeve Gastrectomy, and Gastrectomy.

Dr. George Bolen is a gastroenterologist affiliated with Sibley Memorial Hospital and Suburban Hospital, as well as an associate clinical professor of medicine at George Washington University School of Medicine and Georgetown University School of Medicine. He practices out of Capital Digestive Care’s Metropolitan Gastroenterology Group in Washington, D.C. and Bethesda, Md. Dr. Bolen has an expertise in hepatology and clinical research. Dr. Bolen earned his undergraduate degree from the Massachusetts Institute of Technology and his medical degree from Yale University School of Medicine. He completed a residency in internal medicine at New York Hospital, as well as a fellowship in gastroenterology. Dr. Bolen served as a Major in the United States Air Force Medical Corps from 1982-1986. Dr. Bolen is a diplomate of the American Board of Internal Medicine, as well as a member of the American College of Gastroenterology, the American Medical Association, the Crohn’s and Colitis Foundation of America, the Washington Society of Gastroenterology and the American Gastroenterological Association, amongst other organizations. Dr. Bolen has been named a Super Doctor by the Washington Post Magazine, a Top Doctor by Consumers’ Checkbook Magazine and a Top Doctor in the Washington, D.C., Baltimore and Washington-Baltimore areas by Castle Connolly. Dr. Bolen is rated as a Distinguished provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Gastroesophageal Reflux Disease (GERD), Gastric Dysmotility, Irritable Bowel Syndrome (IBS), and Indigestion.

Eric Pollack is a Gastroenterologist in North Bethesda, Maryland. Dr. Pollack is rated as a Distinguished provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Gastroesophageal Reflux Disease (GERD), Familial Adenomatous Polyposis, Diverticular Disease, and Indigestion.

Dr. Collier is graduate from Georgetown University Medical School, Washington D.C. and he has been in practice since 2000 in Rockville, MD. Dr. Collier received advanced training in Gastroenterology and Endoscopic Ultrasound from prestigious organizations such as Georgetown University Hospital, Washington Veteran's Hospital and the National Institutes of Health. Dr. Collier's top priority is to advance the delivery of care for patients suffering from digestive health conditions. His goal is to provide high quality patient care, medical diagnosis and the most effective treatment. He is married with three children. For more information on Dr. Collier, visit CapitalDigestiveCare.com. Dr. Collier is rated as a Distinguished provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Irritable Bowel Syndrome (IBS), Indigestion, Gastroesophageal Reflux Disease (GERD), Portal Hypertension, and Gastrectomy.

Dr. Vera L. Sheen is a Johns Hopkins Community Physician practicing out of Sibley Primary Care located in Sibley Memorial Hospital’s Medical Building in Washington, D.C. She is affiliated with Georgetown University Hospital as well. Dr. Sheen has an expertise in internal medicine. Dr. Sheen earned her medical degree from University of Kentucky College of Medicine. She completed a residency in internal medicine at Barnes-Jewish Hospital. Dr. Sheen is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Vitamin D Deficiency, High Cholesterol, Vitamin B12 Deficiency Anemia, and Folate Deficiency.

Dr. Natalie A. Earl is an otolaryngologist affiliated with Sibley Memorial Hospital, Georgetown University Hospital, Washington Hospital Center and Children’s National Medical Center. She practices out of Feldman ENT Group in Chevy Chase, Md. and Germantown, Md. Dr. Earl has an expertise in rhinoplasty and facial plastic surgery, sinus disease, sinonasal surgery, sleep and snoring disorders, head and neck cancers and pathology, and pediatric otolaryngology. Dr. Earl earned her medical degree from Hahnemann University School of Medicine. She completed a residency in otolaryngology, head and neck surgery at Georgetown University Hospital, where she served as chief resident. Dr. Earl is a fellow of the American College of Surgeons, a diplomate of the American Academy of Otolaryngology Head and Neck Surgery, a member of the American Medical Association and a secretary/treasurer for the Washington Metropolitan Otolaryngology Head and Neck Society. Dr. Earl is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). Her top areas of expertise are Nasal Septal Hematoma, Low Nasal Bridge, Burning Mouth Syndrome, and Glossodynia.

"Dr. Gary Roggin is a gastroenterologist in Bethesda, Maryland. He received his medical degree from University of Michigan Medical School and has been in practice for more than 40 years. Dr. Roggin is one of 22 doctors at Suburban Hospital who specialize in gastroenterology. Dr. Roggin truly cares about his patients and will do his best to pinpoint the real cause of your medical problems, tirelessly working with you to resolve your medical issues. He will take the time to understand your medical history to help you maintain a healthy diet and lifestyle. Videos 2015 Clinical Collaboration and Teamwork Award - Gary Roggin, M.D., Pharmacy Team, Suburban Hospital Selected Publications Roggin, G. M. ""Medicare managed care. How physicians can make it better."" Gastroenterol Clin North Am Mautner, G. C., Mautner, S. L., Lin, F., Roggin, G. M., Roberts, W. C. ""Amounts of coronary arterial luminal narrowing and composition of the material causing the narrowing in Buerger's disease."" Am J Cardiol Roggin, G. M., Iber, F. L., Kater, R. M., Tabon, F. ""Malabsorption in the chronic alcoholic."" Johns Hopkins Med J Roggin, G. M., Iber, F. L., Linscheer, W. G. ""Intraluminal fat digestion in the chronic alcoholic."" Gut Roggin, G. M., Moses, D., Kautcher, M., Wishner, W., Shuman, C. ""Ketosis and metabolic alkalosis in a patient with diabetes."" JAMA Kater, R. M., Roggin, G., Tobon, F., Zieve, P., Iber, F. L. ""Increased rate of clearance of drugs from the circulation of alcoholics."" Am J Med Sci Roggin, G. M., Banwell, J. G., Yardley, J. H., Hendrix, T. R. ""Unimpaired response of rabbit jejunum to cholera toxin after selective damage to villus epithelium."" Gastroenterology". Dr. Roggin is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Esophagitis, Crohn's Disease, Barrett Esophagus, and Gastric Dysmotility.

Dr. Andrew N. Umhau is an internist affiliated with Sibley Memorial Hospital and Georgetown University Hospital. He practices out of Foxhall Internists in Washington, D.C. Dr. Umhau has an expertise in general internal medicine, with clinical interests in adolescent and young adult medicine, medical problems of pregnancy and cross-cultural issues. Dr. Umhau earned his undergraduate degree from Davidson College and his medical degree from Duke University. He completed a residency in internal medicine at Georgetown University, where he became chief resident. Dr. Umhau was named a Super Doctor by the Washington Post and has been named one of the Best Doctors in America. Castle Connolly named him a Top Doctor in the Washington, D.C. and Washington-Baltimore areas in 2012. Dr. Umhau also earned the 2009 Laureate Award by the American College of Physicians, Washington, D.C. chapter. Dr. Umhau is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are High Cholesterol, Recurrent Peripheral Facial Palsy, Facial Paralysis, and Bell's Palsy.

William Condrell is a primary care provider, practicing in Family Medicine in Washington, Washington, D.c.. Dr. Condrell is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Attention Deficit Hyperactivity Disorder (ADHD), Erectile Dysfunction (ED), Persistent Genital Arousal Disorder, and Insomnia.

Dr. Lawrence E. Klein is an internist affiliated with Sibley Memorial Hospital; Johns Hopkins Hospital, where he holds a part-time faculty appointment; and Georgetown University Hospital, where he also holds a faculty appointment. He practices out of Foxhall Internists in Washington, D.C. Dr. Klein completed a joint M.D.-Ph.D. program at Johns Hopkins University School of Medicine, where he was elected into the AOA Medical Honor Society. He completed a residency in internal medicine at Strong Memorial Hospital of the University of Rochester, followed by a fellowship in internal medicine at Johns Hopkins Hospital. Dr. Klein was one of the country’s first Henry J. Kaiser Foundation fellows in internal medicine. He went on to serve as a full-time Johns Hopkins medical faculty member. Dr. Klein previously served as the president of the D.C. Society of Internal Medicine and the governor of the D.C. Chapter of the American College of Physicians. Dr. Klein has been repeatedly named a Top Doctor in Washingtonian magazine and Consumers’ Checkbook magazine, as well as named a Super Doctor in the Washington Post magazine and one of the Best Doctors in America. He was awarded the American College of Physicians John H. Maher Laureate Award in 2001 and inducted as a Master of the American College of Physicians in 2009. Dr. Klein has contributed to numerous publications and presentations, abstracts and posters, and lectures on various topics. Dr. Klein is rated as an Experienced provider by MediFind in the treatment of Gastroesophageal Reflux Disease (GERD). His top areas of expertise are Chronic Lymphocytic Leukemia (CLL), Chronic B-Cell Leukemia (CBCL), Richter Syndrome, and Familial Hypertriglyceridemia.