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Leaders in Providing Advanced Endoscopy and Pain Management Services

The physicians at Advanced Surgery Center of Long Island are recognized leaders in their field and are as committed to ensuring patients’ comfort, privacy and dignity, as they are to performing the highest quality, state-of-the-art endoscopic diagnostic procedures.

Meet Our Board Certified Gastroenterologists

William J. Cohn, M.D. | Gary R. Bernstein, M.D. | Eugene A. Coman, M.D. | Howard A. Keschner, M.D. | Robert J. Baranowski, M.D. | Seth E. Persky, M.D. | Emily Glazer, M.D. | Eugene Licht, M.D. 

Meet Our Board Certified Pain Management Physicians

Jonathan Raanan, M.D. | Donald S.F. Macron, M.D.

William J. Cohn, M.D.

Dr. Cohn is the founding partner of Long Island Digestive Disease Consultants. He is board certified in Internal Medicine and Gastroenterology. While he has a special interest in liver disease and inflammatory bowel disease, Dr. Cohn’s practice encompasses all areas of clinical gastroenterology. He has been with Long Island Digestive Disease Consultants for over 35 years.

Dr. Cohn has served as Chief of Gastroenterology at both John T. Mather and St. Charles Hospitals. He holds an appointment as Assistant Clinical Professor at the Stony Brook University School of Medicine. In addition, Dr. Cohn has been President of the medical staff, member of the Medical Board and member of the Board of Trustees at St. Charles Hospital. His service to John T. Mather Hospital and the community was honored in 2002 by the Nassau-Suffolk Hospital Council with the presentation of the Theodore Roosevelt Award. Dr. Cohn has been selected by the Castle Connolly Guide and New York magazine as one of the best doctors in the New York metropolitan area.

Medical Degree:
Medical College of Virginia,
 Richmond, Virginia

Residency:
Internal Medicine:
Medical College of Virginia,
 Richmond, Virginia

Fellowships:
Gastroenterology:
Albert Einstein College of Medicine,
Bronx, New York
Clinical Liver Disease: 
Medical College of Virginia,
Richmond, Virginia

Professional Affiliations:
American Association for the Study of Liver Disease
American College of Gastroenterology
American Gastroenterological Association
American Society of Gastrointestinal Endoscopy

Hospital Affiliations:
John T. Mather Memorial Hospital, Port Jefferson, New York
St. Charles Hospital, Port Jefferson, New York
Stony Brook University Hospital, Stony Brook, New York
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Gary R. Bernstein, M.D.

Dr. Bernstein is board certified in Internal Medicine and Gastroenterology. His practice encompasses all of gastroenterology, with a special interest in inflammatory bowel disease, as well as advanced therapeutic endoscopic procedures involving diseases of the gallbladder, biliary tract and pancreas.

Dr. Bernstein was honored as one of the “Best Doctors in New York” by the Castle Connolly Guide to Americas Top Doctors. He served on the Medical Board and the Board of Directors at John T. Mather Memorial Hospital and received the prestigious Theodore Roosevelt Award in 2002 for his exceptional commitment to the hospital and the community. Dr. Bernstein also served as President of the medical staff at John T. Mather Memorial Hospital and on the Joint Planning Committee for the Mather-St. Charles Alliance. He was voted Man of the Year in Medicine by the Village Beacon Record in 1987.

Medical Degree:
University of Miami, Miami, Florida

Residency:
Chief Resident – Internal Medicine: State University of New York at Stony Brook, Stony Brook, New York
Internal Medicine: State University of New York at Stony Brook, Stony Brook, New York

Fellowship:
Gastroenterology: State University of New York at Stony Brook, Stony Brook, New

Professional Affiliations:
American College of Gastroenterology
American Gastroenterological Association
American Society of Gastrointestinal Endoscopy
American Association for the Study of Liver Disease
Long Island Gastroenterological Association

Hospital Affiliations:
John T. Mather Memorial Hospital, Port Jefferson, New York
St. Charles Hospital, Port Jefferson, New York
Stony Brook University Hospital, Stony Brook, New York
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Eugene A. Coman, M.D.

Dr. Coman is board certified in Internal Medicine and Gastroenterology. He has a special interest in ulcerative colitis and Crohn’s Disease. Dr. Coman has published several articles in leading gastroenterology journals, spanning topics such as novel endoscopic techniques, ischemic disease of the intestine, and unusual intestinal infections. He is currently an Assistant Clinical Instructor at Stony Brook University Hospital. He has served on multiple hospital committees and was President of the Medical Staff at St. Charles Hospital.

Medical Degree:
Columbia University College of Physicians and Surgeons, New York, New York

Residency:
Chief Resident – Internal Medicine: Bronx Municipal Hospital Center and Weiler Hospital/Albert Einstein College of Medicine, Bronx, New York
Internal Medicine: Bronx Municipal Hospital Center and Weiler Hospital/Albert Einstein College of Medicine, Bronx, New York

Fellowship:
Gastroenterology: Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, New York

Professional Affiliations:
American College of Gastroenterology
American Gastroenterological Association
American Society of Gastrointestinal Endoscopy

Hospital Affiliations:
John T. Mather Memorial Hospital, Port Jefferson, New York
St. Charles Hospital, Port Jefferson, New York
Stony Brook University Hospital, Stony Brook, New York
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Howard A. Keschner, M.D.

Dr. Keschner is board certified in Internal Medicine and Gastroenterology. His special interests include gastroesophageal reflux disease, inflammatory bowel disease and functional gastrointestinal disorders including irritable bowel syndrome. He performs esophageal manometry as well as Ambulatory pH monitoring of the esophagus.

 

Medical Degree:
State University of New York – Downstate Medical Center Brooklyn, New York

Residency:
Internal Medicine: Jacobi Medical Center /Albert Einstein College of Medicine, Bronx, New York

Fellowship:
Gastroenterology: Temple University Hospital, Philadelphia, Pennsylvania

Professional Affiliations:
American College of Gastroenterology
American Gastroenterological Association
American Society of Gastrointestinal Endoscopy

Hospital Affiliations:
John T. Mather Memorial Hospital, Port Jefferson, New York
St. Charles Hospital, Port Jefferson, New York
Stony Brook University Hospital, Stony Brook, New York
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Robert J. Baranowski, M.D.

Dr. Baranowski is board certified in Internal Medicine and Gastroenterology and has advanced training in ERCP and biliary manometry. He has a broad range of clinical interests, including gastroesophageal reflux disease, esophageal motility disorders, biliary and pancreatic diseases, as well as colon cancer screening. Dr. Baranowski performs special procedures including esophageal pH and manometric studies, endoscopic mucosal resection, enteral stenting, tumor palliation with argon plasma coagulation and advanced therapeutic biliary procedures such as ERCP.

Dr. Baranowski is the current Chief of Gastroenterology at John T. Mather Memorial Hospital. He is on the nutrition committee and participated in the Colon Cancer Symposium at Mather Hospital to educate the public about colon health and cancer prevention. Additionally, Dr. Baranowski also served on the Medical Board of St. Charles Hospital. He enjoys giving educational lectures on digestive diseases and participates in medical lectures at Stony Brook University Hospital.

Medical Degree:
Temple University School of Medicine Philadelphia, Pennsylvania

Residency:
Internal Medicine: Abington Memorial Hospital, Abington, Pennsylvania

Fellowship:
Gastroenterology/Hepatology
Temple University Hospital, Philadelphia, Pennsylvania

Professional Affiliations:
American College of Gastroenterology
American Gastroenterological Association
American Society of Gastrointestinal Endoscopy

Hospital Affiliations:
John T. Mather Memorial Hospital, Port Jefferson, New York
St. Charles Hospital, Port Jefferson, New York
Stony Brook University Hospital, Stony Brook, New York
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Seth E. Persky, M.D.

Dr. Persky is board certified in Gastroenterology. His practice encompasses all of gastroenterology, although he has a special interest in Inflammatory Bowel Disease and diseases of the small intestine. He was one of the first gastroenterologists on Long Island to perform small bowel capsule endoscopy, a technique that enables detailed evaluation of suspected disease of the small intestine. He is considered an expert in the interpretation of these complex studies.

Dr. Persky has published multiple articles on the management of infectious and ischemic diseases of the large intestine, and has written a textbook chapter on this subject. He has also published several articles on drug induced liver disease. Additionally, he served on the Medical Advisory Board for Gastroenterology and Endoscopy News, a widely read monthly newspaper for the gastroenterology community, from 2001 to January of 2007. He also served as a member of the medical board of John T. Mather Memorial Hospital in 2007.

Medical Degree:
New York University School of Medicine, New York, New York

Residency:
Internal Medicine: Yale-New Haven Hospital, New Haven, Connecticut

Fellowship:
Gastroenterology: Montefiore Medical Center/Albert Einstein College of Medicine, Bronx, New York

Professional Affiliations:
American College of Gastroenterology
American Gastroenterological Association
American Society of Gastrointestinal Endoscopy

Hospital Affiliations:
John T. Mather Memorial Hospital, Port Jefferson, New York
St. Charles Hospital, Port Jefferson, New York
Stony Brook University Hospital, Stony Brook, New York
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Emily Glazer, M.D.

Dr. Glazer is board certified in Gastroenterology. Her practice encompasses all of Gastroenterology with special interests in colorectal cancer screening and surveillance, liver diseases and women’s issues in gastroenterology and hepatology. Dr. Glazer has published multiple articles on management of unusual and high-risk colorectal polyps, as well as the risk of colorectal cancer in patients with Crohn’s disease and ulcerative colitis. She is currently an Assistant Clinical Instructor at Stony Brook University Hospital.

Medical Degree:
New York University School of Medicine, New York, New York

Residency:
Internal Medicine:
Mount Sinai Medical Center,
New York, New York

Fellowship:
Digestive Diseases:
Beth Israel Medical Center/Albert Einstein College of Medicine,
New York, New York

Professional Affiliations:
American College of Gastroenterology
American Gastroenterological Association
American Society of Gastrointestinal Endoscopy

Hospital Affiliations
John T. Mather Memorial Hospital
Port Jefferson, New York
St. Charles Hospital,
Port Jefferson, New York
Stony Brook University Hospital, Stony Brook, New York
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Eugene Licht, M.D.

Dr. Licht completed his Fellowship training in Gastroenterology and Nutrition at Memorial Sloan Kettering Cancer Center in New York City.  His practice encompasses all aspects of gastroenterology, with a particular focus on colorectal cancer screening and early detection of colon cancer and polyps.  He is credentialed as a Certified Nutrition Support Clinician and has a specific interest in the nutritional aspects of caring for patients with cancer.

Dr. Licht’s research interests are diverse and range from the management of Clostridium difficile infections to the palliation of gastrointestinal symptoms related to cancer and its treatment.

Medical Degree:
Weill Cornell Medical College
New York, New York

Residency:
Internal Medicine:
New York-Presbyterian Weill Cornell Medical Center
New York, New York

Fellowship:
Gastroenterology and Nutrition:
Memorial Sloan Kettering Cancer Center
New York, New York

Professional Affiliations:
Alpha Omega Alpha Honor Medical Society
American College of Gastroenterology
American Gastroenterological Association
American Society for Gastrointestinal Endoscopy

Hospital Affiliations:
John T. Mather Memorial Hospital
Port Jefferson, New York

Charles Hospital
Port Jefferson, New York

Stony Brook University Hospital
Stony Brook, New York

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Jonathan Raanan, M.D.

Diplomate, American Board of Physical Medicine and Rehabilitation, 2006
Dr. Jonathan Raanan, a Board-certified Physiatrist (Physical Medicine & Rehabilitation specialist), concentrates his practice on the diagnosis and treatment of disorders of the spine. He is focused on prescribing physical therapy, minimizing medications and performing non-surgical procedures for the treatment of conditions such as degenerative disc disease, sciatica (radiculopathy), arthritis of the spine (spondylosis), herniated discs and spinal stenosis. Dr. Raanan’s expertise includes performance of epidural injections, joint injections (e.g. facet, sacroiliac), and radiofrequency nerve ablation – all performed using fluoroscopic guidance to maximize safety and accuracy.

Dr. Raanan is an Assistant Professor of Neurological Surgery and Physical Medicine & Rehabilitation at Stony Brook University Hospital. His professional memberships include the American Academy of Physical Medicine & Rehabilitation and the International Spine Intervention Society. Dr. Raanan is the Director of Outpatient Services for the Department of Neurosurgery at Stony Brook University Hospital. He has served in the past as the Medical Director of Spine Physiatry at Peconic Bay Medical Center.

Training:
Spine and Sports Medicine Fellowship: Chicago Institute of Neurosurgery and Neuroresearch
Physical Medicine and Rehabilitation Residency/Chief Resident: Columbia and Cornell Medical Centers – New York Presbyterian Hospital
Medical School and Internship: New Jersey Medical School – University of Medicine & Dentistry of New Jersey

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Donald S.F. Macron, M.D.

Diplomate, American Board of Physical Medicine and Rehabilitation, 2010
Dr. Donald S.F. Macron is a Board-Certified Physiatrist (Physical Medicine & Rehabilitation specialist) fellowship trained in non-surgical sports medicine and spine care. His emphasis is on the use of non-pharmacological and non-surgical means, such as physical therapy and image-guided procedures, to optimize the patient’s function and activity. His practice includes the diagnosis and care of the back, neck, and tailbone pain, as well as nerve pain originating from these areas radiating to the limbs, such as sciatica-type pains. Dr. Macron routinely performs spinal procedures such as epidural injections, facet joint procedures, and injections of the large joints like hips, knees, shoulders and the sacroiliac joint. He also performs impar ganglion blocks and injections of the sacrococcygeal joint for tailbone pain.

Dr. Macron is an Assistant Professor of Neurological Surgery and Physical Medicine & Rehabilitation at Stony Brook University Hospital. He studied medicine at Boston University, earning MD and MA degrees. Dr. Macron trained at the Mount Sinai Hospital in New York City, and completed a fellowship in Sports and Spine Rehabilitation Medicine at the University of Pennsylvania in Philadelphia. He has published in textbooks on spine injury and rehabilitation, and in journals such as Annals of Thoracic Surgery and Pain Physician.

Training:
Spine, Sports and Musculoskeletal Rehabilitation Fellowship: University of Pennsylvania
Physical Medicine and Rehabilitation Residency: Mount Sinai Hospital
Internship: St Vincent Hospital – Worcester Medical Center
Medical School: Boston University School of Medicine

 

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