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Information on the

Center for Interventional Endoscopy

The Center for Interventional Endoscopy (CIE) was created to effectively integrate therapeutic endoscopy with minimally invasive surgery to provide state-of-the-art care for patients with complex digestive disease problems. Our mission is to foster cutting-edge clinical research and train the next generation of endoscopists and minimally invasive surgeons. The Center for Interventional Endoscopy (CIE) serves as a regional, national and international referral center for patients who may benefit from advanced endoscopic interventions. The center is staffed by a team of internationally renowned endoscopists who have extensive experience in the management of complex digestive disorders.

For a detailed report on patient referrals, procedures, current research, publications, educational initiatives and other resources, please click below to download a copy of the CIE Annual Report for 2019.

Meet Our Team

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  • Ji Young Bang, MD

    Director of Clinical Research, Center for Interventional Endoscopy
  • Muhammad Hasan, MD

    Advanced Endoscopy Fellowship

  • Robert Hawes, MD

    Medical Director
    Institute for Minimally Invasive Therapy

  • Udayakumar Navaneethan, MD

    Director, IBD Center and Interventional IBD Unit, AdventHealth Orlando, Center for Interventional Endoscopy
    Assistant Professor of Internal Medicine, University of Central Florida College of Medicine

  • Shyam Varadarajulu, MD

    Medical Director
    Center for Interventional Endoscopy

More About Our Physicians

Center for Interventional Endoscopy Physicians
Robert Hawes, MD, Muhammad K. Hasan, MD, Ji Young Bang, MD, Shyam Varadarajulu, MD, Udayakumar Navaneethan, MD
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Ji Young Bang, MD

Dr. Ji Young Bang is a board-certified internal medicine physician fellowship-trained in gastroenterology.

Dr. Bang received her medical degree from University College London Medical School and completed a Master of Public Health degree at Imperial College of London . She completed a residency in internal medicine at the University of Alabama at Birmingham where she quickly became established as a dedicated researcher and was awarded the Young Investigator Travel Award for the American Pancreatic Association, and the distinguished TIME-R (Trainees in Internal Medicine Mentored Experience in Research) Award. Following her time at UAB, she completed a fellowship in gastroenterology at Indiana University School of Medicine in Indianapolis, IN.

Dr. Bang is widely published in the fields of gastroenterology and interventional endoscopy and is a member of the American Society of Gastrointestinal Endoscopy, the American Gastroenterology Association and the American College of Gastroenterology.

Additional Details

Board Certifications
Internal Medicine - The American Board of Internal Medicine

Medical School - University College of London Medical School

University of Alabama at Birmingham

Gastroenterology - Indiana University

Muhammad K. Hasan, MD

Dr. Muhammad K. Hasan is board certified in gastroenterology and internal medicine. He has dedicated his practice towards advanced and complex endoscopy. He specializes in the treatment of Barrett’s esophagus, endoscopic resection of small and large bowel polyps, small bowel endoscopy, double balloon enteroscopy, pancreatic and biliary disorders with particular expertise in Therapeutic ERCP and Endoscopic Ultrasound (EUS). Dr. Hasan currently serves as the Director of Advanced Endoscopy Fellowship program at CIE and Assistant Professor of Medicine at the University of Central Florida. Dr. Hasan completed his advanced endoscopy training at Mayo Clinic Jacksonville and Medical University of South Carolina where he also has worked as an instructor in internal medicine. He has authored multiple professional articles and book chapters.

Additional Details:

Board Certifications
Gastroenterology – American Board of Internal Medicine
Internal Medicine – American Board of Internal Medicine

Internal Medicine – University of Oklahoma, Oklahoma City
Chief Resident Internal Medicine – University of Oklahoma, Oklahoma City

Gastroenterology – University of Oklahoma, Oklahoma City
Endoscopic Ultrasound (EUS) – Mayo Clinic Jacksonville, Florida
Advanced ERCP – Medical University of South Carolina

Robert Hawes, MD

Rob Hawes grew up in Bloomington, Indiana.  He attended Indiana University for his undergraduate education graduating Phi Beta Kappa with a degree in Chemistry in 1976.  He attended Indiana University School of Medicine, graduating in 1980.  He continued his training at Indiana University completing a three-year residency in Internal Medicine and a two-year fellowship in Gastroenterology under the guidance of Dr. Glen Lehman and is boarded in both Internal Medicine (1985) and Gastroenterology (1987).  Dr. Hawes spent a year in London, England (1985-1986) doing an Advanced Endoscopy Fellowship concentrating on ERCP and endoscopic laser therapy under the direction of Peter B. Cotton and Steve Bown respectively. 

Dr. Hawes returned to Indiana University in the fall of 1986 and served on the faculty in the Division of Gastroenterology from 1986-1994.  During this time, he was promoted from Assistant to Associate and ultimately to Full Professor in July of 1994.  After being introduced to endoscopic ultrasound at the Middlesex Hospital, he established the EUS program at IU in 1987; one of the first 5 training centers in the US. He continued his work in pancreatobiliary endoscopy and established a multimodality treatment center for the non- operative management of gallstones.

In July of 1994, Dr. Hawes re-connected with Peter Cotton and moved to the Medical University of South Carolina (MUSC) in Charleston to help in forming a new Digestive Disease Center.  This center is designed to facilitate the integration of GI medicine, surgery and radiology into an integrated unit to promote patient care, research, training and technology development to improve the treatment of patients with digestive diseases.  During his tenure at MUSC, the institution became recognized nationally and internationally for excellence in EUS, ERCP and therapeutic endoscopy.

Dr. Hawes served on several committees and the governing board of the American Society for Gastrointestinal Endoscopy (ASGE). Dr. Hawes went on to serve as president of the ASGE in 2005-2006. Dr. Hawes feels strongly that advances in therapeutic endoscopy will be dependent on close collaboration between therapeutic endoscopists and minimally invasive surgeons. Immediately following his ASGE presidency, he joined with David Rattner from Massachusetts General Hospital and immediate past president of the Society of American Gastrointestinal Endoscopic Surgeons (SAGES) to form the Natural Orifice Surgery Consortium for Assessment and Research (NOSCAR) committee. This goal of this joint ASGE/SAGES committee is to responsibly develop a new paradigm in minimally invasive surgery called NOTES (natural orifice transluminal endoscopic surgery).

Dr. Hawes has published over 300 peer-reviewed articles and written numerous book chapters. He has lectured and performed a live demonstration in over 30 countries throughout Europe, Asia and the Americas. In 2006, MUSC awarded Dr. Hawes the Peter B. Cotton Endowed Chair for Endoscopic Innovation – the 1st endowed chair for endoscopy in the United States. Dr. Hawes is a co-editor with 2 of his closest friends, Paul Fockens and Shyam Varadarajulu, of the most widely read textbook on Endoscopic Ultrasound and in the fall of 2014, they released the 3rd edition.

In January 2012, Dr Hawes moved to AdventHealth Orlando, formerly Florida Hospital Orlando, with 2 friends and former trainees, Shyam Varadarajulu and Muhammad Hasan to develop the Center for Interventional Endoscopy. A state-of-the-art endoscopy unit was built and serves as the focal point for a referral practice concentrating on advanced endoscopic practice, clinical research designed to impact endoscopy and training advanced fellows. A 2nd mission for Dr. Hawes is to work with another close friend, Dr. Steve Eubanks; an internationally recognized minimally invasive surgeon. Together, they will build an Institute for Minimally Invasive Therapy to further integrate therapeutic endoscopy and minimally invasive surgery to improve patient outcomes through research, education and device and technique development.

Udayakumar Navaneethan, MD

Dr. Navaneethan completed his Gastroenterology fellowship as well as an advanced endoscopy year at the Cleveland Clinic in Cleveland, Ohio. In addition to therapeutic endoscopy, he has fundamental interest in IBD and primary sclerosing cholangitis and throughout his training worked with Dr. Bo Shen who is an internationally recognized expert in the endoscopic management of complications associated with IBD. Dr. Navaneethan has already published more than 120 peer-reviewed articles and has authored several textbook chapters many focusing on the endoscopic management of IBD. Dr. Navaneethan is a recipient of multiple research grants from the American College of Gastroenterology and IBD working group for developing biomarkers in bile for diagnosis of bile duct cancers in patients with primary sclerosing cholangitis and IBD. Dr. Navaneethan has been recruited to AdventHealth Orlando by CIE to provide tertiary level care to complex IBD patients and patients with primary sclerosing cholangitis. Dr. Navaneethan has undergone advanced training in ERCP, EUS, Double Balloon Enteroscopy (DBE), chromoendoscopy, endoscopic mucosal resection (EMR) and other complex endoscopic procedures. His addition will provide us the bandwidth to further develop the areas of endoscopic submucosal dissection (ESD), Peroral Endoscopic Myotomy (POEM), endoscopic applications in bariatric patients and hybrid procedures combining laparoscopy and flexible endoscopy. 

Shyam Varadarajulu, MD

Dr. Varadarajulu is board certified in Internal Medicine and Gastroenterology-Hepatology. He specializes in the treatment of complex pancreatic and biliary disorders with particular expertise in Endoscopic Ultrasound (EUS) and Therapeutic ERCP. His other areas of procedural expertise include interventional EUS, endoscopic management of pancreatic fluid collections, sphincter of Oddi manometry and luminal dilation and stent placement.

Dr. Varadarajulu is a Professor of Medicine at the University of Central Florida and is the Medical Director of CIE. He was formerly an Associate Professor of Medicine and Pediatrics and Chief of Endoscopy at the University of Alabama at Birmingham. He has more than 210 peer-reviewed publications, 25 textbook chapters and is the Editor of the textbook ENDOSONOGRAPHY. He was also a Section Editor (Endoscopy) for the American Gastroenterological Association journal Clinical Gastroenterology and Hepatology and currently a Deputy Editor-in-Chief for the journal Digestive Endoscopy. He is an author in UpToDate and reviews for more than 30 professional journals.

  • Advanced Endoscopy Fellowship in EUS and ERCP at the Medical University of South Carolina.
  • Gastroenterology Fellowship at the University of Connecticut Health Center.
  • Medical Residency at the University of Rochester St. Mary’s Hospital.
  • Medical Diploma at Madras Medical College in India.