Faculty: Division of Gastroenterology
Faculty of the Division of Gastroenterology at Georgetown University offer the most advanced diagnostic and treatment techniques available.
To learn more about our faculty, follow the links below to access their MedStar Georgetown University Hospital faculty profiles. If a particular faculty member doesn’t have a link, their profile is currently under development and will be available shortly.
Nadim G. Haddad, MD
Associate Professor of Medicine
Chief, Division of Gastroenterology
Second Floor, Main Hospital, M2025
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-6274
Medical Degree: Texas Technical University Health Science Center, 1988
Internship: Georgetown University & Veterans Administration Medical Center, 1991
Residency: Georgetown University Medical Center, 1991
Fellowship: Georgetown University Medical Center, 1993
Certification: Internal Medicine, 1992; Gastroenterology, 1995, 2008 (recertified)
Special Interests: Endoscopic ultrasonography, hepatobiliary, pancreatic gastrointestinal cancer and gastrointestinal bleeding
Alioska Motamedi, MHA
Regional Administrator, Division of Gastroenterology
Second Floor, Main Hospital
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-1223
Stanley B. Benjamin, MD, FACP, FACG
Professor of Medicine
Second Floor, Main Hospital
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-1669
Fax: (202) 444-4098
Specialties: Gastroenterology
Medical Degree: University of Pittsburgh, 1974
Internship: National Naval Medical Center, 1975
Residency: National Naval Medical Center, 1977
Fellowship: National Naval Medical Center, 1979
Certification: Internal Medicine, 1977; Gastroenterology, 1979
Special Interests: Esophageal disease, biliary endoscopy, esophageal and biliary manometry
John Carroll, MD
Assistant Professor of Medicine
Second Floor, Main Hospital
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-6649
Fax: (202) 444-7074
Specialties: Gastroenterology
Medical Degree: Medical College of Wisconsin, 1993
Internship: Georgetown University, 1994
Residency: Georgetown University, 1996
Fellowship: Gastroenterology, Georgetown University Medical Center, 1999
Certification: Gastroenterology, 2001
Special Interests: Endoscopic ultrasound for digestive cancers, Barrett’s esophagus
Walid Chalhoub, MD
Assistant Professor of Medicine
Second Floor, Main Hospital
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-6274
Fax: (202) 444-7074
Medical Degree: Balamand Medical School, 2005
Internship: Mount Sinai Medical Center, 2009
Residency: Mount Sinai Medical Center, 2011
Fellowship: MedStar Georgetown University Hospital, 2015
Special Interests: Advanced Endoscopy, Pancreaticobiliary diseases, EUS-ERCP, colon cancer detection and screening
Joseph James Jennings, MD
Assistant Professor of Medicine
Second Floor, Main Hospital,
MedStar Georgetown University Hospital
Washington, DC 20007
Medical Degree: Georgetown University School of Medicine, 2012
Internship: MedStar Georgetown University Hospital, 2013
Residency: MedStar Georgetown University Hospital, 2015
Chief Residency: MedStar Georgetown University Hospital, 2016
Fellowship: Gastroenterology, MedStar Georgetown University Hospital, 2019
Certification: Internal Medicine, 2015; Gastroenterology, 2019
Special Interests: GI bleeding and anemia, colon cancer detection and screening, small bowel endoscopy
Annie Kruger, MD, PhD
Assistant Professor of Medicine
Second Floor, Main Hospital,
MedStar Georgetown University Hospital
Washington, DC 20007
Telephone: 202-444-8541
Medical Degree: University of Massachusetts Medical School
Internship: Internal Medicine, Massachusetts General Hospital
Residency: Internal Medicine, Massachusetts General Hospital
Fellowship: Gastroenterology, Massachusetts General Hospital
Certification: Internal Medicine and Gastroenterology
Special Interests: My clinical interests lie in managing liver diseases like fatty liver and NASH, alcoholic hepatitis, autoimmune hepatitis, PBC, PSC, drug induced liver injury, and other causes of cirrhosis. I also have significant clinical expertise in managing a broad of range of general gastrointestinal and inflammatory bowel diseases. My research is focused on exploring the innate and adaptive immune response and stellate cell activity in progressive and regressive NASH
James H. Lewis, MD, FACP, FACG
Professor of Medicine and Director of Hepatology
Second Floor, Main Hospital, M2408
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-1671
Specialties: Gastroenterology
Medical Degree: State University of New York. 1975
Internship: Baylor College of Medicine, 1976
Residency: State University of New York, Downstate Medical Center, 1978
Fellowship: George Washington University Hospital, 1960
Certification: Internal Medicine, 1978; Gastroenterology, 1981
Special Interests: Hepatology (viral hepatitis, hepatitis C, drug-induced liver disease), liver transplantation evaluation, liver and colon cancer screening
Thomas Loughney, MD
Associate Professor of Medicine and Director of Endoscopy Unit
Second Floor, Main Hospital
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-1670
Medical Degree: Georgetown University School of Medicine, 1989
Internship: Walter Reed National Military Medical Center, 1990
Residency: Walter Reed National Military Medical Center, 1992
Fellowship: Walter Reed National Military Medical Center, 1996
Certification: Internal Medicine, 1992; Gastroenterology, 1997
Special Interests: Endoscopy, biliary endoscopy, biliary disease, colon cancer detection and screening, pancreatic disease
Bruce A. Luxon, MD, PhD
Chairman and Chief of Service
Anton and Margaret Fuisz Professor of Medicine
Specialties: Hepatology
Medical Degree: University of Missouri at Columbia, 1985
PhD: Mathematics, University of Missouri at Columbia,1983
Internship: University of Missouri, Columbia, 1987
Residency: University of Missouri, Columbia, 1989
Fellowship: University of California, San Francisco, 1992
Certification: Internal Medicine, 1989; Gastroenterology, 1992, 2002, 2012; Transplant Hepatology, 2006
Special Interests: Special focus in autoimmune hepatitis and cholestatic liver diseases as well as hepatitis C; hepatic stellate cells and the role they play in causing liver fibrosis and cirrhosis.
Mark C. Mattar, MD, FACG, AGAF
Associate Professor of Medicine
Program Director GI Fellowship Training Program
Director, Inflammatory Bowel Disease Center
Second Floor, Main Hospital, M2408
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-1671
Medical Degree: Virginia Commonwealth University School of Medicine, 2004
Internship: Olive View – UCLA Medical Center, 2005
Residency: Olive View- UCLA Medical Center, 2007
Fellowship: Georgetown University Hospital, 2010
Certification: Internal Medicine, 2007; Gastroenterology, 2010
Special Interests: Inflammatory bowel disease, Crohn’s disease, Ulcerative colitis, Microscopic colitis, Celiac disease
Caren S. Palese, MD
Assistant Professor of Medicine
Second Floor, Main Hospital
MedStar Georgetown University Hospital
Washington, DC 20007
(202) 444-3646
Medical Degree: Mount Sinai School of Medicine, 2000
Internship: Georgetown University Hospital, 2001
Residency: Georgetown University Hospital, 2003
Fellowship: Georgetown University Hospital, 2007
Certification: Internal Medicine, 2004; Gastroenterology, 2007
Special Interests: Therapeutic endoscopy, esophageal manometry, gastrointestinal cancers, colon cancer screening
Shervin Shafa, MD
Assistant Professor of Medicine
Second Floor, Main Hospital
Georgetown University Hospital
Washington, DC 20007
(202) 444-1039
Medical Degree: Brody School of Medicine at East Carolina University, 2007
Internship: George Washington University Hospital, 2009
Residency: George Washington University Hospital, 2011
Fellowship: Georgetown University Hospital, 2014
Certification: Internal Medicine, 2011; Gastroenterology, 2014
Special Interests: Esophageal diseases, Esophageal Cancer, Barrett’s esophagus, Zenker’s diverticulum, Endoscopic mucosal resection, Cryoablation, RFA, esophageal strictures, Luminal Stenting, Achalasia treatment/POEM, and a list of esophageal conditions/disorders. I also see colon cancer screening and large polyps.