U.S. Department of Health and Human Services

Current & Recent Gastroenterology Fellows

​​Learn more about current and recent University of Maryland/NIH Clinical Scholars Gastroenterology Fellowship Program fellows below. You can also view a list of recent Gastroenterology Fellow Publications to learn more about research project findings.​

Current Fellows

Photo of Dr. Ehsan Chitsaz, M.D., M.H.Sc.

Ehsan Chitsaz, M.D., M.H.Sc.

Residency: University of Massachusetts, Worcester, MA
Postdoctoral Research Fellowship: Yale University School of Medicine, New Haven, CT
Graduate Degree: Clinical Epidemiology - University of British Columbia, Vancouver, Canada
Medical Degree: Shahid Beheshti University of Medical Sciences, Tehran, Iran
Year in Program: 3rd year
Research Projects: My research interest include clinical, epidemiological and outcomes research in a spectrum of gastrointestinal and liver disorders.  I am currently involved in evaluating the presentation, natural history and diagnosis of familial midgut carcinoid tumor - through an ongoing cohort of familial carcinoid patients at the NIH Clinical Center.  I am interested in population-based risk stratification methods for colorectal cancer screening, volumetric assessments as a surrogate marker for diagnosis and outcomes evaluation of liver disorders, and developing biomarkers to predict gastrointestinal inflammation.

Photo of Dr. Bryan F. Curtin, M.D.

Bryan F. Curtin, M.D.

Residency: University of Maryland Medical Center, Baltimore, MD
Medical Degree: University of Maryland School of Medicine, Baltimore, MD
Year in Program: 3rd Year
Research Projects:  My research interest include multiple areas within gastroenterology including Clostridium Difficile infection, Barrett's esophagus, and quality improvement in screening colonoscopy.  My research projects include studying the treatment efficacy of high dose proton pump inhibitors in the treatment of Barrett's esophagus and the utilization of educational applications to enhance the quality and patient experience of bowel preparation prior to colonoscopy.

Photo of Dr. Ben L. Da, M.D.

Ben L. Da, M.D.

Residency: University of Southern California, Los Angeles, CA
Medical Degree: University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, New Brunswick, NJ
Year in Program: 2nd year
Research Projects: My research interests encompass both luminal GI and hepatology.  I am currently working on projects related to familial carcinoid tumors, CORI database, and non-cirrhotic portal hypertension (NCPH).  The familial carcinoid tumor protocol focuses on evaluating new diagnostic methods and treatment modalities in patients at high risk for developing carcinoid tumors.  Regarding the CORI database, my aim is to better describe clinical features and incidences of gastrointestinal malignancy and precursor lesions within distinct populations inside the United States.  For NCPH, I hope to develop both a diagnostic scoring system to improve earlier diagnosis of NCPH as well as a prognostic scoring system. 

Photo of Dr. Natasha Kamal, M.D.

Natasha Kamal, M.D.

Residency: The Icahn School of Medicine at Mount Sinai, New York, NY
Medical Degree: University of Maryland School of Medicine, Baltimore, MD
Year in Program: 2nd year
Research Projects: My research interests span multiple areas of gastroenterology including liver diseases and inflammatory gastrointestinal diseases.  My current projects and activities include indicators and biomarkers in liver alcoholic liver disease, studying the gastrointestinal manifestations of chronic granulomatous disease and the use of biologics in this population, characterizing and understanding drugs that cause drug induced liver injury (DILI), and hypereosinphilic syndrome/eosinophilic gastroenteritis and the use of elemental diets in this population.  

Recent Fellows 

Photo of Dr. Hawwa Alao, M.D.

Hawwa Alao, M.D.

Current Position: Louis Stokes Cleveland VA Medical Center, Cleveland , OH
Assistant Professor of Medicine - Case Western Reserve University School of Medicine

Photo of Dr. Anna Strongin, M.D.

Anna Strongin, M.D.

Current Position: Practicing Gastroenterologist, Capital Digestive Care, Rockville, MD

Photo of Dr. David M. H. Chascsa, M.D.

David M. H. Chascsa, M.D.

Post Fellowship Training: Transplant Hepatology Advanced Fellowship - Mayo Clinic, Scottsdale, AZ
Current Position: Senior Associate Consultant, Division of Gastroenterology and Hepatology - Mayo Clinic, Scottsdale, AZ
Assistant Professor of Medicine - Mayo Clinic College of Medicine and Science

Photo of Dr. Derek M. Tang, M.D.

Derek M. Tang, M.D.

Current Position: Practicing Gastroenterologist, Kaiser Foundation Hospital - Orange County, Anaheim, CA

Photo of Dr. Nancy Ho, M.D.

Nancy Ho, M.D

Current Position: Assistant Professor of Medicine, Department of Gastroenterology, Oregon Health & Science University, Portland, OR

Photo of Dr. Jim Chou, M.D.

Jim Y. Chou, M.D.

Current Position: Practicing Gastroenterologist, Kaiser Foundation Hospital, Panorama City, CA

Photo of Dr. Mark T. Voellinger, M.D.

Mark T. Voellinger, M.D.

Current Position: Practicing Gastroenterologist, Ohio Valley Medical Center, Wheeling, WV

Photo of Dr. Thomas Simcox, M.D.

Thomas Simcox, M.D.

Current Position: Practicing Gastroenterologist, Anne Arundel, MD

Photo of Dr. Preet Bagi, M.D.

Preet Bagi, M.D.

Post Fellowship Training: Inflammatory Bowel Disease Advanced Fellowship - University of California, San Diego Inflammatory Bowel Disease Center
Current Position: Saddleback Medical Group, Laguna Hills, CA

Photo of Dr. Christopher Koh, M.D. M.H.Sc.

Christopher Koh, M.D. M.H.Sc.

Current Position: Staff Clinician, Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health

Photo of Dr. Sajneet Khangura, M.D.

Sajneet Khangura, M.D.

Current Position: Assistant Professor – Clinical Department of Medicine, Division of Digestive Diseases, The University of Mississippi Medical Center, Jackson, MS

Photo of Dr. Apurva Trivedi, M.D.

Apurva Trivedi, M.D.

Current Position: Assistant Professor – Texas A&M Health Science Center College of Medicine, Department of Gastroenterology, Scott & White Healthcare, Killeen, TX

Photo of Manish Arora, M.B.B.S.

Manish Arora, M.B.B.S.

Current Position: Practicing Gastroenterologist, Decatur, AL

Photo of Dr. Douglas Weinstein, M.D.

Douglas Weinstein, M.D.

Current Position: Staff Physician, Philadelphia VA Medical Center, Philadelphia, PA

Photo of Dr. Apurva Modi, M.D.

Apurva Modi, M.D.

Current Position: Transplant Hepatologist, Baylor All Saints Medical Center, Fort Worth, TX

Photo of Dr. Grishma Joy, M.D.

Grishma Joy, M.D.

Current Position: Practicing Gastroenterologist, Columbia, MD

Photo of Dr. Erik von Rosenvinge, M.D.

Erik von Rosenvinge, M.D.

Current Positions: Chief, Gastroenterology Section, VA Maryland Health Care System, Department of Veterans Affairs
Associate Professor of Medicine, University of Maryland School of Medicine

Photo Dr. Lakshmi Gopal, M.D.

Lakshmi Gopal, M.D.

Current Position: Practicing Gastroenterologist, Pensacola, FL

Photo of Dr. Michael D Yao M.D.

Michael D. Yao, M.D. 

Current Positions: Acting Chief, Gastroenterology and Hepatology Section.  Washington DC VA Medical Center.  Associate Professor of Medicine, George Washington University.


Photo of Dr. Alireza Tabesh, M.D.

Alireza Tabesh, M.D.

Current Position: Practicing Gastroenterologist, Los Angeles, CA