Gastroenterology, Hepatology and Nutrition


Dominique Bailey

Dominique Bailey, MD, MS Ed (2015-2018)


  • Duke University, BA, 2005
  • University of Pennsylvania Graduate School of Education, MS Ed, 2007
  • Georgetown University School of Medicine, MD, 2012

Postgraduate Training

  • Intern and Resident, Pediatrics, Columbia University Medical Center and NewYork-Presbyterian/Morgan Stanley Children's Hospital, 2015
  • Fellow, Pediatric Gastroenterology, Hepatology, and Nutrition, Columbia University Medical Center, 2015

Awards and Honors

  • Distinguished Abstract in Clinical Science, 6th Annual Resident Scholarly Forum, 2015
  • T32 Institutional Training Grant, 2016

Research Plan

  • Dr. Bailey is investigating how epithelial stem/progenitor cells are involved in the pathogenesis of eosinophilic esophgagitis under the mentorship of Jianwen Que, MD, PhD, at the Columbia Center for Human Development. She is also working to build a pediatric eosinophilc esophagitis databank for current and future research studies.

Elizabeth Berg

Elizabeth Berg, MD (2016-2019)


  • Barnard College, Columbia University, BA, 2004
  • New York Medical College, MD, 2013

Postgraduate Training

  • Intern and Resident, Icahn School of Medicine at Mount Sinai, 2013-2016
  • Fellow, Pediatric Gastroenterology, Hepatology, and Nutrition, Columbia University Medical Center, 2016-present

Awards and Honors

  • Arnold P. Gold Humanism and Excellence in Teaching Award, 2016
  • Ramon Murphy Resident Humanitarian Award, 2016
  • Donald & Irwin Gribetz Excellence in Primary Care Award, 2016

Laurence Feinstein

Laurence Feinstein, MD (2015-2018)


  • University of Maryland, BS, 2007
  • Sackler School of Medicine, New York State/American Program, MD, 2011

Postgraduate Training

  • Intern and Resident, Children's National Medical Center, 2011-2014
  • Associate Attending, Pediatric Emergency Department, Children's National Medical Center, 2014-2015
  • Fellow, Pediatric Gastroenterology, Hepatology, and Nutrition, Columbia University Medical Center, 2015

Awards and Honors

  • Pediatric Resident Teaching Award, Children's National Medical Center, 2013
  • Children’s National Medical Center Research Day, Honorable Mention for Clinical Research, 2014

Research Plan

  • Dr. Feinstein is investigating signaling pathways in the enteric nervous system that regulate intestinal motility, luminal fluid secretion, and secretion of gut-derived hormones using mouse genetic models under the guidance of Michael Gershon, MD, and Meenakshi Rao, MD, PhD.

Sarah Fleet, MD (2014-2017)


  • University of Connecticut School of Medicine, MD, 2011
  • Connecticut College, BA, 2005

Postgraduate Training

  • Resident, Pediatrics, Morgan Stanley Children’s Hospital of New York Presbyterian, Columbia University Medical Center 2014
  • Fellow, Pediatric Gastroenterology, Hepatology, and Nutrition, Columbia University Medical Center, 2014

Awards and Honors

  • Best Abstract 2014 Resident Research Forum
  • NASPGHAN Teaching & Tomorrow Award Recipient 2012
  • New England Pediatrics Society Award for Excellence in Pediatrics 2011
  • Linda Ives Award for Excellence in Pediatric Research 2011

Amir Jayzayeri

Amir Jayzayeri, MD (2016-2019)


  • Marquette University, BS, 2007
  • Texas Tech University, MBA, 2009
  • Texas Tech Health Science Center, MD, 2013

Postgraduate Training

  • Intern and Resident, St. Christopher Hospital for Children, 2013-2016

Vania Kasper

Vania Kasper, MD (Hepatology Fellow, 2016-2017)


  • Syracuse University, BA, 1996
  • SUNY Downstate College of Medicine, MD, 2006

Postgraduate Training

  • Intern and Resident, SUNY Downstate Medical Center, 2008-2011
  • Chief Resident, Pediatrics, SUNY Downstate Medical Center, 2011-2012
  • Fellow, Pediatric Gastroenterology, Hepatology, and Nutrition, Brown University, 2012-2015

Awards and Honors

  • Excellence as a Pediatric Resident, 2011
  • Doris H. Milman, MD, Award - Excellence as a Pediatric Resident, 2011
  • 2014 Lifespan Clinical Research Center Research Scholar Award
  • T32 Institutional Training Grant, 2014

Research Plan

  • Retrospective study looking at the most efficient work-up to diagnose biliary complications in post-transplant patients.

Arunjot Singh, MD, MPH (GI fellow 2014-2017)


  • Haverford College: BA, 2004
  • Thomas Jefferson University: MPH, 2009
  • Jefferson Medical College: MD, 2011

Postgraduate Training

  • Resident, Social Pediatrics, Children’s Hospital at Montefiore, Albert Einstein Medical Center 2011-2014
  • Fellow, Pediatric Gastroenterology, Hepatology, and Nutrition, Columbia University Medical Center, 2014

Awards and Honors

  • Chairman's Research Award, Montefiore Medical Center 2014
  • Teaching and Tomorrow Program grant for NASPGHAN Conference 2012

Research Plan

  • Dr. Singh is investigating epigenetic patterns in celiac disease and gastrointestinal diseases under the mentorship of Benjamin Tycko, PhD and the Celiac Disease Center. Studying bioinformatics and genomic sequencing, he is working to build a pediatric celiac disease databank and foster collaborative research efforts with the New York Genome Center.



Publications by Previous Fellows

Ekong UD, Mathew J, Melin-Aldana H, Wang D, Alonso EM. Successful resolution of inflammation and increased regulatory T cells in sirolimus-treated post-transplant allograft hepatitis. Pediatr Transplant. 2012 Mar;16(2):165-75

Feng S, Ekong UD, Lobritto SJ, Demetris AJ, Roberts JP, Rosenthal P, Alonso EM, Philogene MC, Ikle D, Poole KM, Bridges ND, Turka LA, Tchao NK. Complete immunosuppression withdrawal and subsequent allograft function among pediatric recipients of parental living donor liver transplants. JAMA. 2012 Jan 18;307(3):283-93

Ekong UD, Melin-Aldana H, Whitington PF. Regression of severe fibrotic liver disease in 2 children with neonatal hemochromatosis. J Pediatr Gastroenterol Nutr. 2008 Mar;46(3):329-33

Ekong U, Zeng S, Dun H, Feirt N, Guo J, Ippagunta N, Guarrera JV, Lu Y, Weinberg A, Qu W, Ramasamy R, Schmidt AM, Emond JC. Blockade of the receptor for advanced glycation end products attenuates acetaminophen-induced hepatotoxicity in mice. J Gastroenterol Hepatol. 2006 Apr;21(4):682-8

Ekong UD, Kelly S, Whitington PF. Disparate clinical presentation of neonatal hemochromatosis in twins. Pediatrics. 2005 Dec;116(6):e880-4

Cowles RA, Ventura KA, Martinez M, Lobritto SJ, Harren PA, Brodlie S, Carroll J, Jan DM. Reversal of intestinal failure-associated liver disease in infants and children on parenteral nutrition: experience with 93 patients at a referral center for intestinal rehabilitation. J Pediatr Surg. 2010 Jan;45(1):84-7; discussion 87-8.

Kato T, Lobritto SJ, Tzakis A, Raveh Y, Sandoval PR, Martinez M, Granowetter L, Armas A, Brown RS Jr, Emond J. Multivisceral Ex Vivo Surgery for Tumors Involving Celiac and Superior Mesenteric Arteries. Am J Transplant. 2012 May;12(5):1323-

Chapter 72 Postoperative Care of Pediatric Transplant Recipients sumitted to Busuttil & Klintmalm: Transplantation of the Liver, 3rd edition Mercedes Martinez, Steven Lobritto, Jean Emond. 2012

Remotti H, Subramanian S, Martinez M, Kato T, Magid MS. Small-bowel allograft biopsies in the management of small-intestinal and multivisceral transplant recipients: histopathologic review and clinical correlations. Arch Pathol Lab Med. 2012 Jul;136(7):761-71

Dapito DH, Mencin A, Gwak GY, Pradere JP, Jang MK, Mederacke I, Caviglia JM, Khiabanian H, Adeyemi A, Bataller R, Lefkowitch JH, Bower M, Friedman R, Sartor RB, Rabadan R, Schwabe RFPromotion of hepatocellular carcinoma by the intestinal microbiota and TLR4. Cancer Cell. 2012 Apr 17;21(4):504-16

Mencin A, Lavine JE. Advances in pediatric nonalcoholic fatty liver disease. Pediatr Clin North Am. 2011 Dec;58(6):1375-92

Mencin A, Lavine JE. Nonalcoholic fatty liver disease in children. Curr Opin Clin Nutr Metab Care. 2011 Mar;14(2):151-7

Mencin A, Kluwe J, Schwabe RF. Toll-like receptors as targets in chronic liver diseases. Gut. 2009 May;58(5):704-20

Mencin A, Seki E, Osawa Y, Kodama Y, De Minicis S, Knowles M, Brenner DA. Alpha-1 antitrypsin Z protein (PiZ) increases hepatic fibrosis in a murine model of cholestasis. Hepatology. 2007 Nov;46(5):1443-52.

Jung UJ, Millman PN, Tall AR, Deckelbaum RJn-3 fatty acids ameliorate hepatic steatosis and dysfunction after LXR agonist ingestion in mice. Biochim Biophys Acta. 2011 Sep;1811(9):491-7.

Srinivasan P, Brandler M, D'Souza A, Millman P, Moreau H. Allergic enterocolitis presenting as recurrent necrotizing enterocolitis in preterm neonates. J Perinatol. 2010 Jun;30(6):431-3

Radhakrishnan K, Bishop J, Jin Z, Kothari K, Bhatia M, George D, Garvin JH Jr, Martinez M, Ovchinsky N, Lobritto S, Elsayed Y, Satwani P.The Risk Factors Associated with Liver Injury and the Impact of Liver Injury on Transplant Related Mortality in Pediatric Recipients of Allogeneic Hematopoietic Stem Cell Transplantation. Biol Blood Marrow Transplant. 2013

Ovchinsky N, Moreira RK, Lefkowitch JH, Lavine JE. Liver biopsy in modern clinical practice: a pediatric point-of-view. Adv Anat Pathol. 2012 Jul;19(4):250-62.

Ovchinsky N, and Lavine, JE. A critical appraisal of advances in pediatric nonalcoholic Fatty liver disease. Semin Liver Dis. 2012 Nov;32(4):317-24

Ovchinsky N. Conjugated bile acids as potential early markers of parenteral nutrition-associated liver disease. JPEN J Parenter Enteral Nutr. 2010 Sep-Oct;34(5):473-4

Zhang B, Porto AF. Cholesteryl Ester Storage Disease: Protean Presentations of Lysosomal Acid Lipase Deficiency. J Pediatr Gastroenterol Nutr. 2013

Porto AF, Tormey L, Lim JK. Management of chronic hepatitis C infection in children. Curr Opin Pediatr. 2012 Feb;24(1):113-20

Munkacsi AB, Porto AF, Sturley SL. Niemann-Pick type C disease proteins: orphan transporters or membrane rheostats? Future Lipidol. 2007 Jun;2(3):357-367

Kaufman SS, Pehlivanova M, Fennelly EM, Rekhtman YM, Gondolesi GE, Little CA, Matsumoto CS, Fishbein TM. Predicting liver failure in parenteral nutrition-dependent short bowel syndrome of infancy. J Pediatr. 2010 Apr;156(4):580-5

Matsumoto CS, Kaufman SS, Girlanda R, Little CM, Rekhtman Y, Raofi V, Laurin JM, Shetty K, Fennelly EM, Johnson LB, Fishbein TM. Utilization of donors who have suffered cardiopulmonary arrest and resuscitation in intestinal transplantation. Transplantation. 2008 Oct 15;86(7):941-6

Ventura K, Rekhtman Y, Jan D, Emond J, Lobritto S. Isolated liver transplantation for decompensated end-stage liver disease in children with intestinal failure. Transplant Proc. 2006 Jul-Aug;38(6):1699-701

Devlin MJ, Kissileff HR, Zimmerli EJ, Samuels F, Chen BE, Brown AJ, Geliebter A, Walsh BT. Gastric emptying and symptoms of bulimia nervosa: effect of a prokinetic agent. Physiol Behav. 2012 May 15;106(2):238-42

Samuels F, Zimmerli EJ, Devlin MJ, Kissileff HR, Walsh BT. The development of hunger and fullness during a laboratory meal in patients with binge eating disorder. Int J Eat Disord. 2009 Mar;42(2):125-9

Suwandhi E, Ton MN, Schwarz SM. Gastroesophageal reflux in infancy and childhood. Pediatr Ann. 2006 Apr;35(4):259-66

Ton MN, Chang C, Carpentier YA, Deckelbaum RJ. In vivo and in vitro properties of an intravenous lipid emulsion containing only medium chain and fish oil triglycerides. Clin Nutr. 2005 Aug;24(4):492-501

Ton MN, Ruzal-Shapiro C, Stolar C, Kazlow PG. Recurrent sigmoid volvulus in a sixteen-year-old boy: case report and review of the literature. J Pediatr Surg. 2004 Sep;39(9):1434-

Garbarino J, Padamsee M, Wilcox L, Oelkers PM, D'Ambrosio D, Ruggles KV, Ramsey N, Jabado O, Turkish A, Sturley SL. Sterol and diacylglycerol acyltransferase deficiency triggers fatty acid-mediated cell death. J Biol Chem. 2009 Nov 6;284(45):30994-1005

Turkish AR, Sturley SL. The genetics of neutral lipid biosynthesis: an evolutionary perspective. Am J Physiol Endocrinol Metab. 2009 Jul;297(1):E19-27

Turkish A, Sturley SLRegulation of triglyceride metabolism. I. Eukaryotic neutral lipid synthesis: "Many ways to skin ACAT or a DGAT". Am J Physiol Gastrointest Liver Physiol. 2007 Apr;292(4):G953-7

Turkish AR. Nonalcoholic fatty liver disease: emerging mechanisms and consequences. Curr Opin Clin Nutr Metab Care. 2008 Mar;11(2):128-33

Turkish AR, Henneberry AL, Cromley D, Padamsee M, Oelkers P, Bazzi H, Christiano AM, Billheimer JT, Sturley SL. Identification of two novel human acyl-CoA wax alcohol acyltransferases: members of the diacylglycerol acyltransferase 2 (DGAT2) gene superfamily. J Biol Chem. 2005 Apr 15;280(15):14755-64