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Zachary Marwil, MD, is a highly respected and sought-after gastroenterologist on Long Island. Dr. Marwil is a partner at Gastrointestinal Specialists of Long Island (GISLI) and also serves as the managing director at the Northwell Health Endoscopy Center of Long Island. He is board-certified in both gastroenterology and internal medicine.

Dr. Marwil attended the University of Michigan as an undergraduate and earned his Doctor of Medicine from St. George’s University School of Medicine.

Dr. Marwil completed his residency in internal medicine at the State University of New York (SUNY) Downstate Medical Center, where he also had the honor of serving as the chief resident in the department of medicine. He continued his training as a fellow and then as chief fellow in the division of gastroenterology and hepatology at SUNY Downstate Medical Center.

Both during his post-graduate training and as an attending, Dr. Marwil has authored several research abstracts and journal articles. His findings have been published in peer-reviewed journals and presented at national meetings. 

Having held several teaching positions, Dr. Marwil is currently on faculty as an Assistant Professor at the Zucker School of Medicine at Hofstra. He is a member of the American College of Gastroenterology, the American Society of Gastrointestinal Endoscopy, and the New York Society for Gastroenterology and Endoscopy.

Dr. Marwil takes great pride in offering state-of-the-art gastroenterology care for people of all ages and strives to treat each patient with the care and empathy they deserve. When not in the office, Dr. Marwil stays active through mountain biking, skiing, golf, and tennis. He mostly enjoys spending time with his wife and two daughters.

Jeffery Novak, MD, FACG, is a gastroenterologist and partner at Gastrointestinal Specialists of Long Island (GISLI) located in Wantagh and Malverne, New York. He is also a founding member of the Endoscopy Center of Long Island in Garden City, New York. He has been serving patients in the area since 1998. 

Dr. Novak earned his Bachelor of Science in biology from Trinity College, where he was a member of Phi Beta Kappa and received several academic honors. 

Dr. Novak attended medical school at the Albert Einstein College of Medicine, where he earned honors in gastroenterology, infectious disease, and other specialties.

After graduation, Dr. Novak completed his internship and residency in internal medicine at Mount Sinai Hospital in New York City. He then completed his fellowship in gastroenterology at Jackson Memorial Hospital Center in Miami, Florida.

Dr. Novak brings over 25 years of experience to his patients at Gastrointestinal Specialists of Long Island. He diagnoses and treats all gastrointestinal conditions, with his ultimate goal being to ensure that each patient feels comfortable and valued under his care. 

Dr. Novak is a Diplomate of the American Board of Gastroenterology and the American Board of Internal Medicine. He is a member of the American College of Gastroenterology, the American Society of Gastrointestinal Endoscopy, the New York Society for Gastroenterology and Endoscopy, and the Nassau County Medical Society.

Faisal Sheikh, DO is a Gastroenterology specialist in Syosset, New York. Dr. Sheikh is affiliated with Northwell Health and multiple hospitals in the area. He received his medical degree from New York College of Osteopathic Medicine.

After graduating, Dr. Sheikh completed his residency at North Shore University Hospital in Manhasset, New York. He then went on to become double board-certified in Internal Medicine and Gastroenterology.

Dr. Sheikh joined Long Island Gastro in 2014 and has been serving the Syosset community ever since. He is fluent in both English and Urdu.

In his free time away from the practice, Dr. Sheikh enjoys spending time with his family.

Dr. Steven Guttmann, MD is board certified in Internal Medicine and Gastroenterology. He received his BA in psychology from Brooklyn College/CUNY and went on to receive his medical degree from Sackler University. Steven completed his medical residency at Maimonides Medical Center in Brooklyn. After serving as Chief Medical Resident he completed his Gastroenterology Fellowship at Maimonides Medical Center.

Following fellowship, Dr. Guttmann served as a staff attending at Forest Hill-Long Island Jewish Hospital as well as the Director of Endoscopy. He subsequently went on to run a busy inpatient gastroenterology service at Long Island Jewish and North Shore University Hospitals/Northwell.

Dr. Guttmann is an Assistant Professor of Medicine at Hofstra University Medical School and has numerous national publications and presentations on gastrointestinal topics. His interests include general luminal gastroenterology, inflammatory bowel disease, hepato-pancreaticobiliary disease, and therapeutic GI.

Dr. Guttmann is driven by the bonds he builds with his patients, working together with them to achieve a healthy life. 

Jack Husney, MD, offers exceptional gastroenterology and weight-loss services at his eponymous New York City practice, located in Brooklyn, New York. Dr. Husney provides personalized care to patients dealing with medical conditions like peptic ulcers, abdominal pain, and screening colonoscopy.

Dr. Husney is a triple board-certified gastroenterologist who completed his training in both gastroenterology and hepatology at Mount Sinai Hospital in New York City. He  continued his education for non-surgical weight loss at Weill Cornell Medical Center.

Patients struggling to lose weight on their own can count on Dr. Husney to provide the latest non-surgical weight-loss strategies for long-term success.

Dr. Husney also holds the title of Honorary NYPD surgeon, where he serves as a consultant to the New York Police Department in times of need. He has been selected to NY Times Rising Super Doctors. 

Constipation, bloating, and diarrhea are only some of the symptoms Dr. Husney treats on a regular basis. He assists all patients, providing personalized diagnostic testing and treatments for long-term relief of GI problems.

Colonoscopies are one of several essential tools Dr. Husney utilizes to diagnose a wide range of problems in the bowels, such as celiac disease or polyps.

Dr. Husney is a highly respected gastroenterologist, giving patients the leading treatments for chronic GI issues such as Crohn’s disease, GERD, and irritable bowel syndrome (IBS). He takes the time to know each patient in order to provide the best care.

He has engaged in various research projects including basic science research, clinical pharmacology, and clinical research. His work has been published in several major gastroenterology journals and he has presented his research at multiple national conferences. He continues to educate  shares his expertise with residents and medical students. He’s passionate about passing his knowledge on to the next group of doctors in his specialized field.

Call Jack Husney, MD, today to schedule a consultation gastrointestinal issues or weight loss, or book an appointment on the website.

With over two decades of experience. Steven Tawil, MD, is a board-certified gastroenterologist and internist at Brighton Beach Medical Group in New York City. Located in Brighton Beach, Brooklyn, Dr. Tawil gives each patient his undivided attention and spends as much time as needed with each patient to ensure all questions are thoroughly answered. Dr. Tawil offers individualized treatment plans to meet the unique needs of each patient.

After graduating with honors from Brandeis University in Waltham, Massachusetts, Dr. Tawil earned his doctor of medicine degree from the State University of New York’s Upstate Medical University in Syracuse. He completed his internal medicine residency, an internship, and gastroenterology fellowship in New York City at the Albert Einstein College of Medicine of Yeshiva University, Montefiore Medical Center in Morris Park in the Bronx.

Dr. Tawil is affiliated with the New York-Presbyterian Brooklyn Methodist Hospital in Park Slope, Brooklyn, and is a professional member of the American College of Physicians and the American College of Gastroenterology.

Dr. Tawil keeps up to date with the latest advancements in gastroenterology and internal medicine and ensures fast, accurate diagnosis and healing of patients using cutting-edge equipment at Brighton Beach Medical Group.

Dr. Steven Guttmann, MD is board certified in Internal Medicine and Gastroenterology. He received his BA in psychology from Brooklyn College/CUNY and went on to receive his medical degree from Sackler University. Steven completed his medical residency at Maimonides Medical Center in Brooklyn. After serving as Chief Medical Resident he completed his Gastroenterology Fellowship at Maimonides Medical Center.

Following fellowship, Dr. Guttmann served as a staff attending at Forest Hill-Long Island Jewish Hospital as well as the Director of Endoscopy. He subsequently went on to run a busy inpatient gastroenterology service at Long Island Jewish and North Shore University Hospitals/Northwell.

Dr. Guttmann is an Assistant Professor of Medicine at Hofstra University Medical School and has numerous national publications and presentations on gastrointestinal topics. His interests include general luminal gastroenterology, inflammatory bowel disease, hepato-pancreaticobiliary disease, and therapeutic GI.

Dr. Guttmann is driven by the bonds he builds with his patients, working together with them to achieve a healthy life. 

I practice traditional Mt. Sinai trained medicine, with a great appreciation for Integrative and alternative approaches. I look for the latest high-tech approaches including genetic testing, neurocognitive screening, and testing with ‘liquid biopsies’ by a blood test that picks up very early cancers.

I am very open to questions, and I have many years of extensive relationships with excellent subspecialists in various hospitals around the city.

With Elsa, my amazingly competent ‘right hand’, I am available by text when you have a sudden medical concern, when you need lab or X-ray results quickly, a medication refill, an appointment or timing issue, a Covid or booster question, or a question about medication in the news that might pertain to your health.

Elsa Manelli is the heart and soul of the concierge practice. Primary contact person and office manager. Elsa receives and responds to texts and calls reliably, compassionately, and supports me, Stacy, and my patients in a caring and timely fashion. She has trained Allison and Cintia, my office staff, to be equally caring and responsive. Treat them all well, please!

I want to work with patients who appreciate collaboration! ‘You and me versus the issue at hand’.

And I am fortunate to work alongside a wonderful physician assistant with 15 years of experience named Stacy Beaupre who is very involved in integrative care and will be helping me evaluate neurocognitive function. She too is available and on-call.

I can only take a limited number of new concierge patients and I welcome a scheduled five-minute phone conversation where we can see if we are a good fit for one another.

Dr. Jeremy Gutwein was born in Bronx, NY, and grew up in Westchester county. He received his Bachelor of Arts from New York University, Magna Cum Laude with Honors in Psychology in 1998. He received his medical degree from the Albert Einstein College of Medicine in 2002 and completed his internship and residency training in Internal Medicine at Montefiore Medical Center. He then earned a Master of Science degree in Nutrition at New York University in 2006 and went on to receive his training in Gastroenterology, which he completed in 2009, at Montefiore Medical Center. He joined Riverdale Gastroenterology and Liver Diseases immediately following his fellowship training. 

Dr. Gutwein is certified by the American Board of Internal Medicine in Gastroenterology. He is a member of the American College of Gastroenterology, the American Gastroenterological Association, the New York Society of Gastroenterology and Endoscopy, and the American Society for Gastrointestinal Endoscopy. 

Dr. Gutwein is on the medical staff of Montefiore Medical Center. 

Dr. Gutwein lives in Manhattan with his girlfriend, Vivien and his Olde English Bulldogge, Frank. He enjoys Astronomy, physics, comedy and hiking.

Dr. Anthony Ng, M.D., is a leading gastroenterologist dedicated to providing state-of-the-art care to patients from Brooklyn, New York to Lower Manhattan, New York, and throughout the Greater New York City metro region. As the founding physician of GI Health, Dr. Ng offers a comprehensive array of diagnostic and treatment options for patients with issues affecting the gastrointestinal system, including chronic and acute stomach pain, colon cancer, hemorrhoids, and acid reflux, using the most advanced techniques for colonoscopy, upper endoscopy and wireless capsule endoscopy using the PillCam system. Dr. Ng also provides non-invasive screening for colorectal cancer with stool testing including the ground-breaking Cologuard fecal DNA test. In addition, he offers medical weight loss programs customized for the needs of the individual patient for optimal long-term results.

After receiving his medical degree, Dr. Ng completed his training in internal medicine at The Beth Israel Deaconess Hospital in Boston, one of the three major Harvard teaching hospitals, followed by a residency in gastroenterology at The Mount Sinai Hospital in New York City. In addition to caring for patients at his practice, Dr. Ng is also a clinical instructor of medicine at both New York Presbyterian Hospital - Weill Cornell Medical Center and Mount Sinai - Beth Israel Hospital, both top-ranked medical centers in New York City.

At GI Health, Dr. Ng welcomes the opportunity to provide skilled, compassionate, patient-centered care for men and women from throughout New York City.

Dr. Anthony Ng, M.D., is a leading gastroenterologist dedicated to providing state-of-the-art care to patients from Brooklyn, New York to Lower Manhattan, New York, and throughout the Greater New York City metro region. As the founding physician of GI Health, Dr. Ng offers a comprehensive array of diagnostic and treatment options for patients with issues affecting the gastrointestinal system, including chronic and acute stomach pain, colon cancer, hemorrhoids, and acid reflux, using the most advanced techniques for colonoscopy, upper endoscopy and wireless capsule endoscopy using the PillCam system. Dr. Ng also provides non-invasive screening for colorectal cancer with stool testing including the ground-breaking Cologuard fecal DNA test. In addition, he offers medical weight loss programs customized for the needs of the individual patient for optimal long-term results.

After receiving his medical degree, Dr. Ng completed his training in internal medicine at The Beth Israel Deaconess Hospital in Boston, one of the three major Harvard teaching hospitals, followed by a residency in gastroenterology at The Mount Sinai Hospital in New York City. In addition to caring for patients at his practice, Dr. Ng is also a clinical instructor of medicine at both New York Presbyterian Hospital - Weill Cornell Medical Center and Mount Sinai - Beth Israel Hospital, both top-ranked medical centers in New York City.

At GI Health, Dr. Ng welcomes the opportunity to provide skilled, compassionate, patient-centered care for men and women from throughout New York City.