Dr. Mark E. Tanchel is board certified in gastroenterology by the American Board of Internal Medicine. He is a member of the American Gastroenterological Association and the American Society for Gastrointestinal Endoscopy.
A native of Cape Town, South Africa, Dr. Tanchel completed his Gastroenterology fellowship at the University of California San Francisco Medical Center and his medical residency at Tufts-New England Medical Center in Boston. He is a graduate of Tufts University School of Medicine in Boston, where he earned the Walter Dameshek Award for outstanding achievement in Internal Medicine and the Robert J. Fahey Award for excellence in physical diagnosis. He is also a summa cum laude graduate of Brandeis University.
Dr. Tanchel is affiliated with Hackensack University Medical Center at Hackensack Meridian Health where has participated in teaching gastroenterology fellows from the UMDNJ Newark School of Medicine. Dr. Tanchel’s work has been published in peer-reviewed publications. He has been selected as a Top Doctor by NJ TopDocs, as well as a Top Doctor for the New York Metro Area by Castle Connolly.
Dr. Tanchel is a member of Hackensack Digestive Disease Associates
Awards and Recognitions:
Bergen County's Top Doctors 2023
NJ Top Docs 2024
Castle Connolly New York Metro Area
Dr. Frank Ruiz is a gastroenterologist at Gastroenterology Associates of New Jersey.
Dr. Ruiz completed a fellowship in gastroenterology, a residency and internship in internal medicine as well as his medical degree at Rutgers New Jersey Medical School in Newark, NJ.
In addition, he received his Bachelor of Science degree from Seton Hall University in South Orange, NJ.
Awarded Castle Connolly Top Doctors 2023
Dr. Ori Rackovsky carries dual board certification in internal medicine and gastroenterology by the American Board of Internal Medicine.
Dr. Rackovsky earned a bachelor of arts magna cum laude from Yeshiva University in New York City. He earned his medical degree, with distinction in research, from the Icahn School of Medicine at Mount Sinai in New York City. During medical school, Dr. Rackovsky was the recipient of the prestigious Medical Research Fellowship from Howard Hughes Medical Institute to support his research in digestive diseases. Following medical school, he completed his residency in internal medicine at Mount Sinai, during which time he was elected to the Alpha Omega Alpha medical honor society in recognition of outstanding mentoring and clinical skills. He completed his fellowship at Mount Sinai's Dr. Henry D. Janowitz Division of Gastroenterology, where he trained with leaders in the field of inflammatory bowel diseases.
Dr. Rackovsky’s work in liver fibrosis and inflammatory bowel disease has been published in peer-reviewed journals and presented at local, national, and international conferences.
Awarded Castle Connelly Top Doctors Award yearly since 2021
Dr. George N. Pavlou is a gastroenterologist at and President of Gastroenterology Associates of New Jersey (GANJ). He is dual board certified in internal medicine and gastroenterology.
In addition to his position at GANJ, Dr. Pavlou was a clinical instructor at St. George’s University in Grenada, West Indies and a teaching attending at St. Joseph’s Regional Medical Center in Paterson, NJ as well as on the Medical Board of St. Joseph’s Hospital for over 20 years.
He completed a gastroenterology fellowship and an internal medicine residency at St. Joseph’s Regional Medical Center. He received his medical degree from St. George’s University and his Bachelor of Science degree in biomedical engineering from Boston University in Boston, MA.
Dr. Pavlou is a member of the American Gastroenterology Association and the American College of Gastroenterology.
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Awarded Castle Connolly Top Doctors 2023
Awarded Bergen County's Top Doctors 2023
Matthew A. Kutner, DO is a graduate of the UMDNJ School of Osteopathic Medicine. He completed his residency at Beth Israel Medical Center in New York, where he was also honored to be selected as Chief Medical Resident. He completed his gastroenterology fellowship training and an additional fellowship in an advanced endoscopy at Rutgers-University Hospital. Dr. Kutner is a member of Hackensack Digestive Disease Associates
Awarded Castle Connelly Top Doctors 2023
Dr. Gary J. Kosc is a gastroenterologist with Gastroenterology Associates of New Jersey (GANJ) and is board certified by both the American Board of Internal Medicine and the American Board of Gastroenterology.
Prior to his position at GANJ, Dr. Kosc was a partner at a private internal medicine practice as a gastroenterologist.
Dr. Kosc is currently on the teaching faculty at St. Joseph’s Regional Medical Center in Paterson, NJ, where he also completed his fellowship in gastroenterology and his residency in internal medicine. He was also part of an Internal Medicine internship program (the Fifth Pathway Program) at St. Joseph’s.
He received his medical degree from Universidad Autónoma de Guadalajara A.C. in Guadalajara, Mexico and his Bachelor of Science in biology from St. Peter’s University in Jersey City, NJ.
In addition, Dr. Kosc was named New Jersey Top Doc in gastroenterology in 2010.
Awarded Castle Connolly Top Doctors 2021
Dr. Steven D. Gronowitz is a double board certified by the American Board of Internal Medicine and the American Board of Gastroenterology. Prior to his position at GANJ, he was in private practice for over ten years.
Dr. Gronowitz completed a fellowship in gastroenterology and hepatology at New York Medical College in Valhalla, NY. He also completed his residency and internship at Montefiore Medical Center in Bronx, NY. In addition, he received his medical degree from SUNY Health Science Center at Brooklyn in Brooklyn, NY and his Bachelor of Arts in computer science and mathematics at Binghamton University in Binghamton, NY. Currently, he is an Assistant Professor at the Seton Hall-Hackensack Meridian School of Medicine.
Dr. Gronowitz has conducted over ten oral/poster presentations throughout the course of his career on relevant topics regarding gastroenterology. He has also a recipient of a Certificate of Distinction by The Leo M. Davidoff Society for outstanding achievement as a house officer in the teaching of medical students.
Awarded Castle Connolly Top Doctors 2023
Awarded Bergen County's Top Doctors 2023
Dr. Bonnie Cheng is a gastroenterologist at North Jersey Gastroenterology, a division of Gastroenterology Associates of New Jersey (GANJ). She is dual board-certified in Internal Medicine and Gastroenterology by the American Board of Internal Medicine
In addition to performing diagnostic and therapeutic upper and lower endoscopy, Dr. Cheng also performs specialty procedures including High-Resolution Esophageal Manometry, pH testing, and capsule endoscopy
Dr. Cheng completed her fellowship in gastroenterology at Mount Sinai Hospital in New York, NY as well as her residency and internship at Hospital of University of Pennsylvania in Philadelphia, PA. She received her medical degree from SUNY Buffalo and Bachelor of Science in biology at New York University.
Dr. Cheng is a member of North Jersey Gastroenterology
Awards and Recognitions
Castle Connolly Top Doctor Since 2020
Castle Connolly Exceptional Women in Medicine 2022, 2023, 2024
College: University of Michigan, Ann Arbor, MI
Medical school: Columbia University College of Physicians, New York, NY
Residency: Northwestern University, Chicago, IL
Fellowship: Northwestern University, Chicago, IL
Dr. Bleicher is a member of North Jersey Gastroenterology
Awarded Castle Connolly Top Doctors 2023
College: John Hopkins Unversity, Baltimore, MD
Medical school: UMDNJ, Newark, NJ
Residency: University of Maryland, Baltimore, MD
Fellowship: University of Maryland, Baltimore, MD
Dr. Zangara is a member of North Jersey Gastroenterology
