Urbana GI Endoscopy Center,LLC
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Berit-A-Silva-CRNP 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.

Berit A. Silva, CRNP

Ms. Berit Silva is Board Certified by the American Academy of Nurse Practitioners. Following graduation from George Mason University with a Bachelors of Science degree in nursing with honors, Ms. Silva worked as a registered nurse at Shady Grove Adventist Hospital and gained valuable experience treating acutely ill patients. After her experience as a hospital nurse, she pursued her interest in the field of gastroenterology working at an outpatient endoscopy center. Her patient care and professionalism were noted by her superiors, and she was promoted to Charge Nurse of a new large outpatient endoscopy center servicing approximately 4000 patients per year.


As the Director of Operations of the center, Ms. Silva gained considerable experience in the field of gastrointestinal endoscopy and got first-hand experience in dealing with day-to-day practical concerns of patients with gastrointestinal disease. Ms. Silva continued her education at the University of Maryland where she obtained a Masters of Science degree.

Susan Taylor, CRNP

Susan Taylor, CRNP, brings a diverse background to her position as a nurse practitioner at Capital Digestive Care. After earning a Masters of Science degree in Nursing from The Catholic University of America, she worked as a staff nurse in various facilities specializing in everything from surgical intensive care to geriatric research. In the years that followed she gained intensive experience in the areas of critical care, pain management, orthopedic rehabilitation, cardiac services and internal medicine.


Ms. Taylor has worked as a Nurse Practitioner for Georgetown University Medical Center, Union Memorial Hospital, Veterans Administration Medical Center, Lockheed Martin Corporation, George Washington University Medical Faculty Associates, and National Spine and Pain Centers. Prior to joining Birns, Gloger, Witten & Bhinder, she worked as a Nurse Practitioner for Five Star Physician Services in Owings Mills, Maryland.


Ms. Taylor’s background distinguishes her as a highly professional nurse practitioner who delivers optimal patient care across various disciplines. She excels at evaluating and treating both acute and chronic conditions.

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

Faisal M. Bhinder, MD

Berit A. Silva, CRNP

Susan Taylor, CRNP


Faisal M. Bhinder, MD

Berit A. Silva, CRNP

Mark T. Birns, MD

Victor Witten, MD

Mark S. Gloger, MD

Susan Taylor, CRNP

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


Her academic achievements gained her admittance into the Sigma Theta Tau Honor Society and membership in the Who’s Who of American University Students. Ms. Silva is committed to providing exemplary care to all of her patients. Her extensive education, both through her schooling as well as years of exposure to digestive diseases, has provided her the ability to treat patients with a multitude of gastroenterological problems. After spending some of her childhood in Germany, Ms. Silva was mostly raised in Chicago. She and her family have lived in the Maryland area much of her adult life. She still speaks fluent German.