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Program Director's Message

The three-year gastroenterology fellowship provides extensive experience in all aspects of gastroenterology, endoscopy, hepatology and nutrition. Our fellows have the opportunity to become expert in these areas through NYU Winthrop's formalized centers of excellence with state-of-the-art equipment and through rotations in advanced hepatology and liver transplantation at New York University. Graduating fellows successfully establish themselves in academic or clinical careers of their choice.  Our fellows have presented abstracts and posters at the annual meetings of the American Gastroenterological Association, American College of Gastroenterology, and at NYU Winthrop University’s Research Day.

- Raluca Vrabie, MD

Program Description

Division Chief: James Grendell, MD
Number of Fellowship Positions in Total: 6
Number of Fellowship Positions each year: 2

Clinical Facilities

NYU Winthrop Hospital is a 591 bed hospital and offers a wide variety of clinical services. The hospital boasts many residency and fellowship programs across a variety of specialties and subspecialties. NYU Winthrop is also a clinical campus for Stony Brook University School of Medicine, where each year third year and fourth year medical students complete their clinical training. The large number of house staff and medical students along with the dedicated faculty promotes an academic environment rich in clinical educational experiences.

Clinical Services

General gastrointestinal diseases, gastrointestinal motility and functional disorders, pancreatic diseases, liver & biliary diseases, inflammatory bowel disease, nutrition support, and endoscopy services including ERCP, endoscopic ultrasound, advanced therapeutic biliary and pancreatic endoscopy, and endoscopic treatment of Barrett's esophagus.


Clinical research in pancreatitis, pancreatic cancer, GERD, irritable bowel syndrome, motility disorders of GI system, biliary and pancreatic endoscopy, endoscopic ultrasound and general endoscopy, etiology of chronic abdominal pain, and technologies in therapeutic endoscopy.


  • Opportunity to attain competency in gastrointestinal motility, through the Gastrointestinal Diagnostic Motility Center
  • Opportunity to become expert in enteral and parenteral nutrition in the inpatient and outpatient settings
  • 100% success rate in GI residents becoming board certified in nutrition
  • Extensive training in all aspects of liver disease
  • Development of expertise in the management of Pancreatic and Biliary Disease
  • Excellence in all areas of endoscopic training
  • Exposure to the role of endoscopic ultrasound and advanced therapeutic endoscopic procedures
  • Rotations through advanced hepatology and liver transplantation at New York University and general gastroenterology at New York University
  • Opportunity for electives in gastroenterology, pediatric gastroenterology, radiology, and community practices among others
  • Generous house staff benefits, including heavily subsidized housing and complimentary meals


Education in standard GI procedures during the first year is followed during the second and third year with training in the newer modalities of investigational and therapeutic procedures such as endoscopic ultrasound, laser therapy, colonic and rectal motility studies, and 24-hour monitoring of esophageal pH and motility. Throughout the three-year program, fellows follow patients in the weekly outpatient GI and liver clinics, and gain knowledge in nutrition and total parenteral nutrition by participating in the nutrition support team and nutrition clinic. In their second and third years, GI fellows learn techniques of clinical basic research.

Application Procedure

NYU Winthrop Hospital accepts applications for its Gastroenterology fellowship program only through the Electronic Residency Application Service (ERAS)

The application must include the following:

  • Dean’s Letter
  • Medical School Transcript
  • At least 3 Letters of Reference
  • Curriculum Vitae including honors and publications in ERAS format
  • USMLE/COMLEX Transcript
  • Personal Statement
  • Photograph

Selected applicants will be invited to schedule an interview after review of their application. If you have been selected for an interview you will receive an email with information about how to make these arrangements.

Interviews take place from September through October.


  1. Alagheband S, Malet P, Katz D, Davis-Lorton M. Angioedema of the small intestine: A great imitator. Clin Res Hepatol Gastroenterol. 2017 Mar;41(2):121-122. doi: 10.1016/j.clinre.2016.09.007. Epub 2016 Nov 4. PubMed PMID: 27825635.
  2. Singh K, Chapalamadugu P, Malet P. Upper Gastrointestinal Bleeding Due to Amyloidosis in a Patient With Multiple Myeloma. Clin Gastroenterol Hepatol. 2016 Nov;14(11):A22-A23. doi: 10.1016/j.cgh.2016.07.015. Epub 2016 Jul 21. PubMed PMID: 27451090.
  3. Patel KS, Benshar O, Vrabie R, Patel A, Adler M, Hines G. A major pain in the… Back and epigastrium: an unusual case of spontaneous celiac artery dissection. J Community Hosp Intern Med Perspect. 2014 Nov 25;4(5):23840. doi: 10.3402/jchimp.v4.23840. eCollection 2014. PubMed PMID: 25432642; PubMed Central PMCID: PMC4246143.
  4. Vrabie R, Kane S. Noninvasive Markers of Disease Activity in Inflammatory Bowel Disease. Gastroenterol Hepatol (N Y). 2014 Sep;10(9):576-84. PubMed PMID: 27551251; PubMed Central PMCID: PMC4991533.
  5. Patel Z, Patel S, Grendell J, Marciano T. Type 2 autoimmune pancreatitis: case report of a 9-year-old female and a review of the literature. Clin J Gastroenterol. 2015 Dec;8(6):421-5. doi: 10.1007/s12328-015-0615-6. Epub 2015 Nov 21 Review. PubMed PMID: 26590828.
  6. Grendell JH. Persisting early hypotension: is this why necrosis gets infected in acute pancreatitis? Dig Dis Sci. 2015 Feb;60(2):285-7. doi: 10.1007/s10620-014-3413-y. PubMed PMID: 25371152.
  7. Patel KS, Marshak J, Patel AM, Grendell JH, Brathwaite CE. Clot busters! Relief of gastric outlet obstruction after Roux-en-Y gastric bypass. Endoscopy. 2014;46 Suppl 1 UCTN:E470. doi: 10.1055/s-0034-1377544. Epub 2014 Oct 14. PubMed PMID: 25314201.
  8. Marshak JE, Panzarella P, Morim A, Iqbal S, Grendell JH. A "twist" on S1S2: descending colon volvulus causing severe left hemi-diaphragm elevation. J Emerg Med. 2014 Aug;47(2):e59-60. doi: 10.1016/j.jemermed.2014.04.015. Epub 2014 Jun 6. PubMed PMID: 24910363.
  9. Friedel D, Modayil R, Stavropoulos S. Colon Capsule Endoscopy: Review and Perspectives. Gastroenterol Res Pract. 2016;2016:9643162. Epub 2016 Sep 6. Review. PubMed PMID: 27698664; PubMed Central PMCID: PMC5028851.
  10. Stavropoulos SN, Friedel D, Modayil R, Parkman HP. Diagnosis and management of esophageal achalasia. BMJ. 2016 Sep 13;354:i2785. doi: 10.1136/bmj.i2785. Review PubMed PMID: 27625387.
  11. Stavropoulos SN, Modayil R, Friedel D. The State of The Art in Per-Oral Endoscopic Myotomy. Semin Thorac Cardiovasc Surg. 2016 Spring;28(1):137-46. doi: 10.1053/j.semtcvs.2015.12.008. Epub 2016 Jan 4. Review. PubMed PMID: 27568151.
  12. Khashab MA, Van der Merwe S, Kunda R, El Zein MH, Teoh AY, Marson FP, Fabbri C, Tarantino I, Varadarajulu S, Modayil RJ, Stavropoulos SN, Peñas I, Ngamruengphong S, Kumbhari V, Romagnuolo J, Shah R, Kalloo AN, Perez-Miranda M, Artifon EL. Prospective international multicenter study on endoscopic ultrasound-guided biliary drainage for patients with malignant distal biliary obstruction after failed endoscopic retrograde cholangiopancreatography. Endosc Int Open. 2016 Apr;4(4):E487-96. doi: 10.1055/s-0042-102648. Epub 2016 Mar 30. PubMed PMID: 27092334; PubMed Central PMCID: PMC4831932.
  13. Stavropoulos SN. The New NOTES: More "E" and Less "S" Leads to Success! Gastrointest Endosc Clin N Am. 2016 Apr;26(2):xv-xvi. doi: 10.1016/j.giec.2016.01.001. PubMed PMID: 27036908.
  14. Modayil R, Stavropoulos SN. A Western Perspective on "New NOTES" from POEM to Full-thickness Resection and Beyond. Gastrointest Endosc Clin N Am. 2016 Apr;26(2):413-32. doi: 10.1016/j.giec.2015.12.014. Epub 2016 Feb 28. Review. PubMed PMID: 27036906.
  15. Khashab MA, Messallam AA, Penas I, Nakai Y, Modayil RJ, De la Serna C, Hara K, El Zein M, Stavropoulos SN, Perez-Miranda M, Kumbhari V, Ngamruengphong S, Dhir VK, Park DH. International multicenter comparative trial of transluminal EUS-guided biliary drainage via hepatogastrostomy vs. choledochoduodenostomy approaches. Endosc Int Open. 2016 Feb;4(2):E175-81. doi: 10.1055/s-0041-109083. Epub 2016 Jan 15. PubMed PMID: 26878045; PubMed Central PMCID: PMC4751013.
  16. Maranki J, Stavropoulos SN. Endoscopic Submucosal Dissection in the Colorectum: Not Just for Mucosal Lesions. Clin Gastroenterol Hepatol. 2016 Apr;14(4):582-4. doi: 10.1016/j.cgh.2015.12.016. Epub 2015 Dec 11. PubMed PMID: 26687914.
  17. Maranki J, Stavropoulos SN. Endoscopic Submucosal Dissection in the Colorectum-Not Just for Mucosal Lesions.
  18. Clin Gastroenterol Hepatol. 2015 Dec 11. pii: S1542-3565(15)01653-5. doi: 10.1016/j.cgh.2015.12.016. [Epub ahead of print] No abstract available.
  19. Stavropoulos SN, Friedel D. Closing acute iatrogenic perforations: there are holes in the data!
  20. Gastrointest Endosc. 2015 Oct;82(4):629-30. doi: 10.1016/j.gie.2015.07.005. No abstract available.
  21. Stavropoulos SN, Modayil R, Friedel D. Per oral endoscopic myotomy for the treatment of achalasia.
  22. Curr Opin Gastroenterol. 2015 Sep;31(5):430-40. doi: 10.1097/MOG.0000000000000206.
  23. Stavropoulos SN, Modayil R, Friedel D. Current applications of endoscopic suturing.
  24. World J Gastrointest Endosc. 2015 Jul 10;7(8):777-89. doi: 10.4253/wjge.v7.i8.777. Review.
  25. Diehl DL, Johal AS, Khara HS, Stavropoulos SN, Al-Haddad M, Ramesh J, Varadarajulu S, Aslanian H, Gordon SR, Shieh FK, Pineda-Bonilla JJ, Dunkelberger T, Gondim DD, Chen EZ. Endoscopic ultrasound-guided liver biopsy: a multicenter experience.
  26.  Endosc Int Open. 2015 Jun;3(3):E210-5. doi: 10.1055/s-0034-1391412. Epub 2015 Feb 27.
  27. Kumbhari V, Tieu AH, Onimaru M, El Zein MH, Teitelbaum EN, Ujiki MB, Gitelis ME, Modayil RJ, Hungness ES, Stavropoulos SN, Shiwaku H, Kunda R, Chiu P, Saxena P, Messallam AA, Inoue H, Khashab MA. Peroral endoscopic myotomy (POEM) vs laparoscopic Heller myotomy (LHM) for the treatment of Type III achalasia in 75 patients: a multicenter comparative study.
  28. Endosc Int Open. 2015 Jun;3(3):E195-201. doi: 10.1055/s-0034-1391668. Epub 2015 Apr 13.
  29. Mikityanskiy Y, Marshak JE, Stavropoulos SN, Friedel DM. Images of the Month: Excavated Duodenal Gastrointestinal Stromal Tumor Diagnosed via Standard Endoscopic Biopsy. Am J Gastroenterol. 2015 Jul;110(7):964. doi: 10.1038/ajg.2014.402. No abstract available.
  30.  ASGE PIVI Committee, Chandrasekhara V, Desilets D, Falk GW, Inoue H, Romanelli JR, Savides TJ, Stavropoulos SN, Swanstrom LL. The American Society for Gastrointestinal Endoscopy PIVI (Preservation and Incorporation of Valuable Endoscopic Innovations) on peroral endoscopic myotomy. Gastrointest Endosc. 2015 May;81(5):1087-100.e1. doi: 10.1016/j.gie.2014.12.007. Epub 2015 Mar 19. No abstract available.
  31.  Winner M, Sethi A, Poneros JM, Stavropoulos SN, Francisco P, Lightdale CJ, Allendorf JD, Stevens PD, Gonda TA. The role of molecular analysis in the diagnosis and surveillance of pancreatic cystic neoplasms.JOP. 2015 Mar 20;16(2):143-9. doi: 10.6092/1590-8577/2941.
  32. Khashab MA, Messallam AA, Onimaru M, Teitelbaum EN, Ujiki MB, Gitelis ME, Modayil RJ, Hungness ES, Stavropoulos SN, El Zein MH, Shiwaku H, Kunda R, Repici A, Minami H, Chiu PW, Ponsky J, Kumbhari V, Saxena P, Maydeo AP, Inoue H. International multicenter experience with peroral endoscopic myotomy for the treatment of spastic esophageal disorders refractory to medical therapy (with video).
  33. Gastrointest Endosc. 2015 May;81(5):1170-7. doi: 10.1016/j.gie.2014.10.011. Epub 2015 Jan 26.
  34. Patel KS, Calixte R, Modayil RJ, Friedel D, Brathwaite CE, Stavropoulos SN. The light at the end of the tunnel: a single-operator learning curve analysis for per oral endoscopic myotomy. Gastrointest Endosc. 2015 May;81(5):1181-7. doi: 10.1016/j.gie.2014.10.002. Epub 2015 Jan 16.
  35. Arlene Stein; Sunita Sidhu-Bonocore; James H. Grendell.  In:  Matarese, LE, Mullin, GE, Raymond JL, eds. The Health Professional’s Guide to Gastrointestinal Nutrition, Cathy Iammartino, publisher, 2014; pp 137-144.
  36. Grendell JH.  Structure and Function of the Exocrine Pancreas.  In:  Reinus JF, Simon , eds. Gastrointestinal Anatomy and Physiology.  The Essentials.  UK:  WileyBlackwell, 2014; pp 78-90.
  37.  Khashab MA, Saxena P, Kumbhari V, Nandwani M, Roland BC, Stein E, Clarke JO, Stavropoulos SN, Inoue H, Pasricha PJ. Peroral endoscopic myotomy as a platform for the treatment of spastic esophageal disorders refractory to medical therapy (with video). Gastrointest Endosc. 2014 Jan;79(1):136-9. doi: .1016/j.gie.2013.08.021.
  38.  Marshak JE, Patel AM, Friedel DM, Stavropoulos SN. Retrieval of impacted esophageal stent in the ileum with double balloon enteroscopy: a novel technique. Acta Gastroenterol Belg. 2014 Mar;77(1):81-82
  39.  Kumbari V, Azola A, Saxena P, Modayil R, Kalloo AN, Stavropoulos SN, Khasab MA.  Closure methods in submucosal endoscopy. Gastrointestinal Endoscopy. 2014 Mar 26. Pii S0016-5107(14)001163-3 Epub ahead of print.
  40. Ghevariya V, Pitea TC, Stavropoulos SN. Aortoesophageal fistula with aortitis: Endoscopic management. Gastrointestinal Endoscopy. 2014 Mar 1. Pii S0016-5107(14)00100-X.  Epub ahead of print.
  41. Modayil R, Friedel D, Stavropoulos SN. Endoscopic suture repair of a large mucosal perforation during peroral endoscopic myotomy for treatment of achalasia. Gastrointest Endosc. 2014 May 13. pii: S0016-5107(14)01304-2. doi: 10.1016/j.gie.2014.03.035.

Key Faculty

James H. Grendell, MD
Chief, Division of Gastroenterology, Hepatology & Nutrition

Graduated from College of Medicine, Ohio State University. Internship and residency in Internal Medicine completed at Beth Israel Hospital in Boston, Massachusetts. Gastroenterology fellowship completed at University of California, San Francisco. Dr. Grendell is board certified GI, is a Professor of Medicine, State University of New York at Stony Brook School of Medicine and has a special interest in diseases of the pancreas.

David Friedel, MD
Associate Director, GI Endoscopy and Endoscopic Ultrasound

Graduated from the State University of New York Upstate Medical Center in Syracuse, New York. Internal Medicine residency completed at Maimonides Medical Center, Brooklyn, New York, and gastroenterology fellowship completed in 1989 at Temple University, Philadelphia, Pennsylvania. In GI practice 1989 – 2004. EUS fellowship from September 2004 - April 2005 at Winthrop-University Hospital. May 2005 to present –Attending Physician, Division of Gastroenterology. He is board certified in GI and is Associate Professor of Clinical Medicine, Department of Medicine, State University of New York at Stony Brook, School of Medicine. His specialty is advanced endoscopy procedures.

Stavros Stavropoulos, MD
Director of Gastrointestinal Endoscopy and the Advanced Endoscopy Program

Graduated from Columbia University, College of Physicians and Surgeons, 1994. Internal Medicine residency program completed at Columbia-Presbyterian Medical Center, Gastroenterology Fellowship and Advanced Fellowship training in interventional endoscopy completed at Columbia-Presbyterian Medical Center in 2002. On staff at Columbia 2002-2007. Director of Gastrointestinal Endoscopy and Endoscopic Ultrasound at NYU Winthrop Hospital from October, 2007. He is board certified in GI and his specialty is state-of-the art diagnostics and minimally invasive interventions.

Peter F. Malet, MD
Director, Center for Liver Diseases

Graduated from State University of New York Health Science Center at Brooklyn. Internship and residency in Internal Medicine completed at Albany Medical Center, Albany, New York. Gastroenterology fellowship completed at Hospital of the University of Pennsylvania, Philadelphia PA. Assistant/Associate Professor of Medicine at Hospital of the University of Pennsylvania 1982-1997. AssociateProfessor/Professor of Medicine at University of Texas Southwestern Medical Center 1997-2009. He is Director, Center for Liver Diseases at NYU Winthrop Hospital. He is board certified in GI and Transplant Hepatology. His subspecialty is Hepatology.

Bhawna Halwan, MD
Attending Physician

Graduated from medical school, Federal University of Paraiba, Brazil. Internship and residency at State University of New York at Buffalo, New York.

Gastroenterology fellowship completed at Yale University, CT. Masters of Science in Clinical Research, Rollins School of Public Health-Emory University, Atlanta, GA 2008. 2007-2009 Director of Esophageal and Motility Services, State University of New York - Brooklyn. She is board certified in GI and her specialties are: esophageal motility, irritable bowel syndrome, GI bleeding, gastroesophageal reflux disease.

Raluca Vrabie, MD
Attending Physician

Graduated from medical school, Mt. Sinai School of Medicine, New York. Internship and residency in Internal Medicine completed at Mount Sinai Hospital, New York. Gastroenterology fellowship completed at the Hospital of the University of Pennsylvania. Attending physician at NYU Winthrop Hospital, GI Division since August 2010 and Assistant Professor of Clinical Medicine, State University of New York at Stony Brook School of Medicine. She is board certiified in GI and her specialty is: inflammatory bowel disease and women’s health.

Patrick Saitta, MD
Attending Physician, Program in Advanced GI Endoscopy (P.A.G.E.)

Graduated from medical school, Lousiana State University Health Sciences Center, Shreveport, LA. Internship and residency in Internal Medicine Mt. Sinai Hospital, New York, NY. Gastroenterology fellowship completed at Lousiana State University Health Sciences Center, New Orleans, LA. Advanced endoscopy fellowship completed at Lenox Hill Hospital, New York, NY. Dr. Saitta specializes in advanced therapeutic endoscopy for the management of gastrointestinal malignancies as well as diseases of the pancreas and biliary tract.

Rani Modayil, MD
Junior Attending Physician, Program in Advanced GI Endoscopy (P.A.G.E.)

Graduated from medical school, State University of New York at Stony Brook, Stony Brook, NY.  Internship and residency in Internal Medicine Winthrop-University Hospital, Mineola, NY.  Gastroenterology fellowship  and advanced endoscopy fellowship completed at Winthrop-University Hospital, Mineola, NY. Dr. Modayil specializes in advanced therapeutic endoscopy for the management of gastrointestinal malignancies as well as diseases of the pancreas and biliary tract.

Current Fellows


  • Haseeb Ahmed, MD
  • Jarred Marshak, MD


  • Tova Sofer, MD
  • Thomas Coppola, DO

Graduated Fellows


  • Prateek Chapalamadugu, MD
  • Jennifer Slane, DO


  • Anik Patel, MD - private practice
  • Elizabeth Williams, DO - private practice


  • Ritu Saha, MD - private practice
  • Rani Modayil, MD - attending, Division of Gastroenterology, NYU Winthrop Hospital


  • Vineet Korrapati, MD - private practice
  • Paul Panzarella, MD - private practice