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Colon & Rectal Center: About Our Physicians

Debra A. Vachon, M.D.

Debra A. Vachon, M.D.

Colon-Rectal surgeon Debra A. Vachon, M.D., is Director of the Colon and Rectal Center at Mercy. Board certified in both general surgery and colon-rectal surgery, Dr. Vachon received her medical degree from the University of Maryland School of Medicine. A Fellow of the American College of Surgeons and the American Society of Colon and Rectal Surgeons, Dr. Vachon sees patients at Mercy Medical Center in downtown Baltimore and in private practice at McDonogh Crossroads in Owings Mills, MD. Dr. Vachon is a member of the Colon Rectal Surgical Associates.

Dr. Vachon has made numerous presentations in her field and related medical fields (e.g. the Delorme procedure for complete rectal prolapse in severely debilitated patients; management of inflammatory carcinoma of the breast; surgical complications in children with HIV infections).

Michael E. Cox, M.D.

Michael E. Cox, M.D.

Michael E. Cox, M.D., is a gastroenterologist and Assistant Chief of Gastroenterology at Mercy.

A graduate of the University of Maryland Medical School, Dr. Cox and has earned certifications in both gastroenterology and internal medicine. His research interests are endoscopic laser surgery and Hepatitis C. He has been a clinical assistant professor of medicine at the University of Maryland since 1981 and was the first medical director of the Maryland Endoscopy Center. He conceived and developed the state's largest outpatient Endoscopy Center, combining 13 physicians, Mercy Medical Center and Helix Health Care, with over 4,000 procedures performed in one year.

Dr. Cox is a member of the American Gastroenterology Association, the American Society of Gastrointestinal Endoscopy and the Maryland Society of Gastrointestinal Endoscopy, serving as president of the latter from 1997 through 1999. His fellowships include the American College of Gastroenterology (FACG) and the American College of Physicians (FACP). He has authored numerous papers and publications in his field.

David B. Posner, M.D.

David B. Posner, M.D.

David B. Posner, M.D., is a gastroenterologist and Chief of Gastroenterology at Mercy (since 1979). A graduate of the University of Maryland School of Medicine and a Fellow in Gastroenterology at the University, Dr. Posner certifications from the American Board of Internal Medicine and in the Subspecialty of Gastroenterology. Fellow of the American College of Physician, he holds membership in the American Gastroenterological Society, the American Society for Gastrointestinal Endoscopy, the American Association for the Study of Liver Diseases, the Baltimore City Medical Society, and other medical-related associations.

In terms of teaching posts, Dr. Posner has served in a teaching capacity for the past 20 years, G.I. Division, University of Maryland and Baltimore V.A. Hospital, and as Attending Physician at Mercy Medical Center, teaching residents in medicine and surgery. He received the Outstanding Physician-Teacher Award for his efforts in 1982. He has authored numerous abstracts and publications in his field.

Scott Huber, M.D.

Scott Huber, M.D.

Scott Huber, M.D., is board certified in internal medicine and specializes in gastroenterology.Dr. Huber completed his fellowship in gastroenterology at Brown University and Rhode Island Hospital. He earned his medical degree from the University of Pittsburgh School of Medicine in 1995, completing his residency in internal medicine through the University of Maryland Medical System in 1998. Dr. Huber has conducted research in the field of gastroenterology at Brown University and Johns Hopkins University.

Jonathan Schreiber, M.D.

Jonathan Schreiber, M.D.

Dr. Jonathan Schreiber earned his medical degree in 1982 from the University of Maryland School of Medicine and completed his Fellowship in Gastroenterology in 1987 at the University of Maryland Hospital. Prior to coming to Mercy, Dr. Schreiber was an Assistant Professor of Medicine at the University of Maryland Hospital. He earned his board certification in Gastroenterology in 1987. He is Clinical Assistant Professor of Medicine at the University of Maryland School of Medicine and holds numerous professional memberships including the American Gastroenterological Association, the American Society for Gastrointestinal Endoscopy and the American College of Gastroenterology. He has spoken on such topics as upper gastrointestinal tract bleeding, peptic ulcer disease and drug therapy for inflammatory bowel disease. He has numerous medical abstracts to his credit.

Patrick Hyatt, M.D.

Patrick Hyatt, M.D.

Patrick Hyatt, M.D., earned his medical degree at the Temple University School of Medicine in Philadelphia. He completed his residency in Internal Medicine and his fellowship in Gastroenterology at Brown University in Providence, Rhode Island.

Dr. Hyatt is certified by the American Board of Internal Medicine and is Board-eligible in Gastroenterology. He has numerous clinical presentations and medical publications to his credit, addressing disorders of the GI tract as well as treatments such as chemoprevention of colon cancer.

Dr. Hyatt is a member of the American Gastroenterological Association, the American Society of Gastrointestinal Endoscopy and the American College of Gastroenterology.

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Phone: 410-783-5800
Tollfree: 1-800-MD-Mercy (1-800-636-3729)

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