Office of Institutional Advancement

Leadership Team

A legacy that achieves. Learn more about the The Digestive Health Institute Leadership Team.


Anthony J. DiMarino, Jr., MD
Chief, Division of Gastroenterology and Hepatology
William Rorer Professor of Medicine
Director, Celiac Center


Areas of Expertise 

  • Gastroenterology and Hepatology
  • Motility Disorders
  • Celiac Disease



When Dr. DiMarino came to Jefferson as the division chief in 1996, he led a team of nine faculty that cared for 6,100 outpatients annually. Under his leadership, Dr. DiMarino has focused on recruiting exceptional specialists and has grown the now nationally ranked division to 37 faculty members that see some 26,000 patients each year. Dr. DiMarino has trained over 100 fellows in his career thus far.


In keeping with Dr. DiMarino’s focus on caring for patients, he has prioritized investing in new and experimental treatments that are more effective, reduce risk and have helped patients live longer with a better quality of life.



  • There are 30 clinical trials happening at any given time in the division.
  • Over the course of his tenure as chief, some 700 peer-reviewed articles were published by Jefferson GI physicians.
  • Personally published over 285 original papers, abstracts, editorials, reviews and book chapters on a wide range of digestive disease issues.
  • Wrote the “white paper” for reprocessing scopes used in GI procedures which has set the standard of practice to this day.
  • Wrote the foreword for the book The Gluten-Free Bible: The Thoroughly Indispensable Guide to Negotiating Life without Wheat.


Robert Coben, MD
Associate Chief, Division of Gastroenterology and Hepatology
Associate Professor of Medicine
Associate Chief for Academic Affairs for the Division


Areas of Expertese 

Benign and Malignant Tumors
Interventional Endoscopy
Oversees and Directs the GI Fellowship Program



  • Since his arrival in 1996, the Jefferson GI Fellows program has graduated 60 GI fellows and 25 advanced fellows (Hepatology and Advanced endoscopy).
  • The program is a sought after clinical placement and has a reputation for providing future gastroenterologists with detailed knowledge and exceptional and diverse clinical experience.
  • Each year the program receives approximately 400 applications per year for four fellowship positions.


Sidney Cohen, MD
J. Edward Berk, MD, Professor of Medicine
Director, Research Programs in Gastroenterology and Hepatology
Co-Director, Gastrointestinal Motility Program


Areas of Expertise

Motility Disorders
Diseases of the Esophagus



  • Past President of the American Gastroenterological Association (AGA) and the Association of Professors of Medicine.
  • Recipient of the Julius Friedenwald Medal, recognizing significant contributions to the AGA and lifelong contributions to the field of gastroenterology.
  • Authored and co-authored more than 400 original papers, abstracts, editorials, reviews and book chapters on a wide range of digestive disease issues.
  • Co-Author of the Bockus Text Book of Gastroenterology under Dr. J. Edward Berk.


Anthony Infantolino, MD
Associate Chief, Division of Gastroenterology and Hepatology
Professor of Medicine
Director, Barrett’s Esophagus Treatment Center
Director, Endoscopic Ultrasound Unit
Co-Director, Jefferson GI Bleeding Center

Area of Expertise
Barrett’s Esophagus



  • Pioneered the use of Radiofrequency Ablation (RFA) in treating Barrett’s Esophagus.
  • Played a key role in changing the standard of care in treating this disease.
  • Currently leads the second most active Barrett’s Esophagus treatment center of 874 centers in the country.
  • Authored 61 articles, 51 abstracts and six book chapters.


Thomas E. Kowalski, MD
Associate Professor of Medicine
Medical Director of Gastrointestinal Endoscopy
Director of the Pancreaticobiliary Program


Areas of Expertise
Advanced Interventional Endoscopy
Diseases of the Pancreas and Bile Ducts
Endoscopic Education and Training
New Endoscopic Technologies


  • Pioneered endoscopic treatment for necrotizing pancreatitis.
  • Has developed and continues to pioneer non-surgical methods to more safely and effectively treat conditions that previously could only be treated through surgical intervention.
  • Initiated and directed Fellowship in Advanced Endoscopy at Thomas Jefferson University.
  • Board of Directors, Thomas Jefferson University Center for Pancreas, Biliary, and Related Cancers.
  • Philadelphia Magazine “Top Doc” for last six consecutive years.
  • Authored more than 150 publications, co-editor of two journals and the textbook Gastrointestinal Disease: An Endoscopic Approach.


Daniel Quirk, MD, MPH, MBA
Associate Chief, Division of Gastroenterology
Associate Professor of Medicine
Director, Gastroenterology Network
Director, Jefferson Endoscopy Center

Areas of Expertiese
General Gastroenterology
Colon Cancer Screening
Barrett’s Esophagus



  • Oversees expansion of Gastroenterology division for services, locations, and network integration.
  • Directed the creation of Jefferson’s first endoscopy center in Bala Cynwyd.
  • Directed the formation of a partnership between Jefferson and private practice GI Groups creating an integrated network, extending from the southern tip of New Jersey to the Lehigh Valley, for the provision of high quality low cost care.
  • Authored 40 publications, book chapters and abstracts and served as the principal investigator of numerous clinical trials.


David A. Sass, MD
Associate Professor of Medicine
Medical Director of Liver Transplantation at SKMC


Area of Expertise
Liver Disease and Transplantation



  • Holds fellowships in the ACP, ACG, AGA and AASLD.
  • Immediate Past President of the PA Society of Gastroenterology.
  • Authored 128 publications, book chapters and abstracts and has been a guest editor for three separate issues of Medical Clinics and Gastroenterology Clinics of North America.
  • Medical Director overseeing the Jefferson Liver Transplant Program which performed the first liver transplant in the Delaware Valley in 1984 and recently achieved the milestone of completing its 1000th liver transplant.
  • Jefferson liver transplant program’s patient and graft survivals have continuously surpassed national and regional benchmarks established by the SRTR and OPTN.
  • At Jefferson, liver transplant candidates now undergo a complete outpatient evaluation for listing in only one week.