Urbana GI Endoscopy Center,LLC
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Victor-Witten,-MD,-PhD,-FACP,-FACG Mark-S.-Gloger,-MD,-AGAF Mark-T.-Birns,-MD,-FACP,-FACG

Dr. Birns is a Diplomate of the American Board of Gastroenterology, as well as a Diplomate of the American Board of Internal Medicine. He graduated from Albert Einstein College of Medicine in New York and then remained there to complete a three year internal medicine residency. Following his residency, he completed a two-year fellowship in gastroenterology at the University of Oregon Health Sciences Center where his input was instrumental in the development of the flexible sigmoidoscope, a routine screening tool in the detection of lower intestinal diseases.


Immediately following his fellowship, Dr. Birns and his family returned to the East Coast, where he was asked to be Assistant Chief of Gastroenterology at the Walter Reed Army Medical Center, as well as Assistant Professor of Medicine at the Uniformed Services University and Health Sciences Medical School in Bethesda, MD. He served as physician for many generals, dignitaries, and members of Congress while also developing specific and recognized expertise in the field of diagnostic and therapeutic endoscopy While at Walter Reed, he instituted a new technique for the treatment of internal bleeding, as well as successfully performing the first endoscopic sphincterotomy in the United States Army, a procedure whereby gallstones can be removed without surgery in certain situations Consequently, he was asked to be the major contributing author to Radiology of the Liver, Biliary Tract, Pancreas, and Spleen, a comprehensive medical textbook which covers his special interest in pancreatic and biliary diseases.


As a result of his continued academic pursuits and contributions to medicine, he was awarded the distinction of being named a Fellow in the American College of Physicians (F.A.C.P.) and a Fellow in the American College of Gastroenterology (F.A.C.G.). He maintains a teaching position at Georgetown University as Associate Clinical Professor of Medicine. Washingtonian Magazine has acknowledged Dr. Birns as one of the Top Doctors in Gastroenterology since 1993.

Mark S. Gloger, MD, AGAF

After growing up in Baltimore, Maryland, Dr. Gloger attended the University of Michigan in Ann Arbor and later returned to the area to attend medical school at Georgetown University. The five subsequent years of his internal medicine and gastroenterology training were completed in New York City; a three year medical residency at the Albert Einstein College of Medicine Hospital System, including the Bronx Municipal Hospital Center and a two year fellowship in gastroenterology at New York University. Both programs are well respected for their intensity, depth of exposure to patients and illnesses, and superlative training.


Following his fellowship in gastroenterology, he pursued his interest in the treatment of liver disease as well as fine-tuned his therapeutic endoscopy skills as a faculty member of the Temple University School of Medicine and Medical College of Pennsylvania affiliated hospitals.


In addition, he gained expertise working with world experts on the role of abnormal gastrointestinal motility as being a major factor in disease processes such as gastro-esophageal reflux, constipation, irritable bowel syndrome, and non-cardiac chest pain. Since 1995, he has been a member of our practice, evaluating and treating patients with all aspects of gastrointestinal and liver disease.


Dr. Gloger is Board Certified in Gastroenterology, as well as Board Certified in Internal Medicine. He has served as Chairman of Gastroenterology at Shady Grove Adventist Hospital. He is a member of the American Gastroenterological Association, American Society of Gastrointestinal Endoscopy, and the American College of Gastroenterology. Washingtonian Magazine has acknowledged Dr. Gloger as one of the Top Doctors in Gastroenterology several times in the past five years.

Prior to joining our practice, Dr. Witten served on staff at Sinai Hospital of Baltimore and held an appointment at Assistant Professor of Medicine at Johns Hopkins University School of Medicine. Dr. Witten brings to the practice skills in therapeutic and interventional endoscopy of malignancies of the pancreas and bile duct, gallstones, pancreatic disease and the new field of endoscopic ultrasonography, (EUS). Dr. Witten received his medical degree, Ph.D., and training in gastroenterology from Vilnius University, Lithuania. He advanced his training in endoscopy at the Central Institute for Postgraduate Medical Doctors in Moscow, Russia.


Dr. Witten’s interests in Interventional Endoscopy resulted in his appointment as Head of the Division of Endoscopy at the 2000 bed Vilnius University Hospital. Upon coming to the United States in 1989, Dr. Witten completed his residency in internal medicine at the Georgetown University - VA Medical Center in Washington, D.C.


He was trained in clinical gastroenterology at the Washington Hospital Center and further advanced his therapeutic and interventional endoscopy skills at the University of Medicine and Dentistry of New Jersey and in Paris.


Dr. Witten has authored more than 60 publications, many accepted for presentation at International and World Congresses of Gastroenterology and Endoscopy. As a result of this contributions, to medicine, he was elected as a Fellow of the American College of Physicians, and as a Fellow of the American College of Gastroenterology. Dr. Witten is Board Certified in Gastroenterology and Internal Medicine.

Anna Strongin, MD

Anna Strongin, MD is a highly trained internist and gastroenterologist. She graduated from Georgetown University with an M.S. in Biophysics and Physiology and earned her Medical Degree from the University of Maryland School of Medicine.


She completed her residency at Thomas Jefferson University Hospital in Philadelphia, PA and followed up with a fellowship through the University of Maryland Medical Center in Baltimore and the National Institutes of Health.


Dr. Strongin comes from a long line of medical practitioners and was inspired to become a doctor by her mother and grandmother – both of whom are physicians. She is a member of the American Gastroenterological Association. She enjoys cooking, traveling, reading mystery novels, and spending time with her husband and daughter.




Medical Education and Training

  • Medical Degree / University of Maryland School of Medicine

  • Master of Science / Biophysics and Physiology / Georgetown University



  • Internal Medicine / Thomas Jefferson University Hospital



  • Gastroenterology / University of Maryland Medical Center / National Institutes of Health


Undergraduate Education

  • Bachelor of Arts / Biology with Distinction / University of Pennsylvania



  • Internal Medicine

         American Board of Internal Medicine

  • Gastroenterology

         American Board of Internal Medicine




Hospital Affiliations:

  • Frederick Memorial Hospital

  • Shady Grove Adventist Hospital


Member of

  • American Gastroenterological Association - Member

Acquaint yourself with  our physicians - get in touch with us today.

Mark T. Birns, MD, FACP, FACG

Mark S. Gloger, MD, AGAF

Victor Witten, MD, PhD, FACP, FACG

Mark T. Birns, MD, FACP, FACG

Victor Witten, MD, PhD, FACP, FACG


Witten, MD

Anna Strongin, MD


Faisal M. Bhinder, MD

Mark S.

Gloger, MD


Strongin, MD

Mark T.

Birns, MD

Faisal M.

Bhinder, MD

Dr. Faisal Bhinder grew up across the globe in Africa, the Middle East, England and Lahore, Pakistan where he earned his medical degree from the King Edward Medical College. Following his training in internal medicine, geriatrics and then gastroenterology and hepatology, he entered private practice in Southern Maryland, establishing Calvert Gastroenterology and serving as Chief of the Division of Gastroenterology and Director of Endoscopy at Calvert Memorial Hospital.


Dr. Bhinder describes gastroenterology as “intriguing, inspiring and challenging” and truly enjoys the hands-on care coupled with practical diagnosis and therapy. He has a particular interest in the field of advanced endoscopy and in 2013 he completed a fellowship in the Advanced Interventional Therapeutic Endoscopy Fellowship Program at the University of Florida HSC Shands Hospital in Gainesville, FL.


This specialized skillset allows Dr. Bhinder to provide an expanded scope of services to patients with complex digestive diseases. In addition to advanced endoscopic diagnostic procedures, Dr. Bhinder is trained to perform advanced therapeutic procedures with Endoscopic Ultrasound and Endoscopic Retrograde Cholangiopancraticography (ERCP) for biliary and pancreatic disease and is proficient as well as authored in Wireless Capsule Endoscopy (WCE).


Special Areas of Interest

  • Acid reflux and Barrett’s esophagus

  • Advanced Interventional Therapeutic Endoscopy

  • Diseases of the biliary and pancreatic systems



Foreign Languages

  • Arabic

  • Punjabi

  • Urdu

Faisal M. Bhinder, MD

Urbana GI Endoscopy Center, LLC
Physicians Anna Strongin