GHI

John J. Ackert, M.D.
Certified Gastroenterologist

Based in Concorde Medical Group’s Kips Bay office, Dr. John Ackert is a highly regarded expert in gastroenterology. He received his medical training here in New York, having graduated from St. John’s University in Queens with a B.S. in Biology and from New York University’s School of Medicine. He went on to complete his medical […]


Edward M. Brettholz, M.D.
Certified Gastroenterologist

Dr. Edward Brettholz received his medical degree from the George Washington University School of Medicine. He completed his Internal Medicine residency at Cedars-Sinai Medical Center in Los Angeles, followed by a Gastroenterology fellowship at the University of California at Irvine and he is board certified in both Internal Medicine and Gastroenterology. Dr. Brettholz is currently […]


Charles N. Friedlander, M.D.
Certified Gastroenterologist

Dr. Friedlander is one of the founding members of Concorde Medical Group. He is a nationally prominent gastroenterologist and is one of New York’s leading and most experienced gastrointestinal endoscopists. His major interest over the years, both in his practice and in his teaching students and house staff at New York University, has been integrating […]


Scott Weber, M.D.
Certified Gastroenterologist

Dr. Scott Weber practices Internal Medicine and Gastroenterology, with special interests in Irritable Bowel, Inflammatory Bowel, and Hepatitis. He is an Assistant Professor of Clinical Medicine at NYU School of Medicine. Dr. Weber earned his Bachelor of Science Degree from Cornell University, and his Medical Degree from NYU School of Medicine, where he was elected […]


Inessa Khaykis, M.D.
Certified Gastroenterologist

Dr. Inessa Khaykis practices gastroenterology with a specialty in advanced procedures such as Endoscopic Ultrasonography (EUS) with FNA and Capsule Endoscopy. Dr. Khaykis graduated with a degree in Medicine from Chelyabinsk Medical Academy. She completed her Internal Medicine residency, chief residency in Internal Medicine, as well as her fellowship in Gastroenterology at the NYU Langone […]


Alex Sherman, M.D.
Certified Gastroenterologist

Dr. Alex Sherman earned his bachelor’s degree from Columbia College and medical degree from the NYU School of Medicine. He completed his medical training at the Bronx Municipal Hospital Center and Albert Einstein College of Medicine. He went on to complete a fellowship in gastroenterology at the NYU Langone Medical Center. Dr. Sherman has published […]


Caterina Oneto, M.D.
Certified Gastroenterologist

Dr. Caterina Oneto is a gastroenterologist who offers her patients expert and compassionate care. Dr. Oneto is a Clinical Assistant Professor within the NYU Division of Gastroenterology, and is Board Certified in Gastroenterology and Internal Medicine. Fluent in Spanish, she graduated with a degree in Medicine and Surgery from the Universidad de Valparaiso in Chile. […]


Jonathan Cohen, M.D.
Certified Gastroenterologist

Dr. Jonathan Cohen graduated from Harvard College and Harvard Medical School. He completed his residency at The Beth Israel Hospital in Boston, his fellowship in gastroenterology at UCLA in Los Angeles, and advanced fellowship in interventional therapeutic endoscope at The Wellesley Hospital in Toronto, Canada. Dr. Cohen is currently a Clinical Professor of Medicine at […]


Lauren Schwartz, M.D.
Certified Gastroenterologist

Dr. Lauren Schwartz is a board-certified gastroenterologist and Clinical Assistant Professor of Medicine at the NYU Langone Medical Center. She is focused on providing quality, compassionate care that incorporates individual patient preferences and values. Dr. Schwartz received her undergraduate degree from Yale University in 1997, graduating magna cum laude with a bachelors of science in […]


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New York, NY 10016

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New York, NY 10279

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Suite 406
New York, NY 10012