Alan Sloyer, M.D.


New York Magazine: Top Doctors: 2021
Top Doctors New York Metro Area (digital guide): 2017, 2018, 2019, 2020, 2021
Newsday – Top Doctors on Long Island: 2017, 2018, 2019, 2020, 2021
Castle Connolly Regional Top Doctors: 1st Edition
Colon & Rectal Cancer Detection
Inflammatory Bowel Disease
Irritable Bowel Syndrome

Internal Medicine

North Shore University Hospital
St. Francis Hospital – The Heart Center


Faculty Appointment
Assistant Clinical Professor, Medicine
Hofstra Northwell Sch Med

1st Residency
North Shore Univ Hosp
Internal Medicine, 1982 – 1985

Medical School

SUNY Downstate, 1982

1st Fellowship
Meml Sloan Kettering
Cancer Ctr
Gastroenterology, 1985 – 1987


New York Magazine: Top Doctors: 2021
Top Doctors New York Metro Area (digital guide): 2017, 2018, 2019, 2020, 2021
Newsday – Top Doctors on Long Island: 2017, 2018, 2019, 2020, 2021
Castle Connolly Regional Top Doctors: 1st Edition


Alan Sloyer, M.D. is a founding member of North Shore Gastroenterology Associates.

He is a 1982 graduate of State University of New York-Downstate Medical Center, College of Medicine where received his M.D. degree with honors.

He was elected a member of Alpha Omega Alpha, the national medical school honor society, in 1982. Prior to entering medical school, he attended Hofstra University where he earned a BA degree, with summa cum laude honors.

He was elected a member of Phi Beta Kappa in 1978.

After graduation from medical school, he entered residency training in Internal Medicine in a combined program at North Shore University Hospital in Manhasset, New York and at Memorial-Sloan Kettering Cancer Center in New York. During that time, he also served as Assistant Chief Resident in the Department of Medicine.

He completed a fellowship in Gastroenterology at Memorial-Sloan Kettering Cancer Center in 1987. During his fellowship, he was a Paul Sherlock Fellow in Gastrointestinal Oncology as well an American Cancer Society Clinical Fellow in Oncology.

Dr. Sloyer has been in practice since July 1987. He is certified by the American Board of Internal Medicine in both Internal Medicine and in Gastroenterology.

Dr. Sloyer actively participates in the education of medical students, residents in Internal Medicine, and fellows in Gastroenterology. He is currently a Clinical Assistant Professor of Medicine at the Hofstra University School of Medicine.

Dr. Sloyer has attained Fellowship in the American College of Physicians and the American College of Gastroenterology.

He is a member of the American College of Gastroenterology, Crohn’s and Colitis Foundation of America and the New York State Medical Society. He attends and presents at many local, national, and international meetings.

Dr. Sloyer is on the professional staffs at North Shore University Hospital (Manhasset and Glen Cove), and at St. Francis Hospital, Roslyn New York.

His interests are largely in the fields of colorectal cancer screening, inflammatory bowel disease and irritable bowel syndrome. He is an expert endoscopist and performs a large number of colonoscopies and upper endoscopies each year.


Dr. Alan Sloyer, a specialist in Gastroenterology, is named a Top Doctor: New York Metro Area 2018

Dr. Alan Sloyer, a Great NeckNY physician specializing in Gastroenterology, has been selected by Castle Connolly Medical Ltd. for inclusion in its authoritative online database of the Top Doctors in the New York Metro Area 2018.


Great NeckNY February 62018— Castle Connolly Medical Ltd., America’s trusted source for identifying Top Doctors, has released Top Doctors: New York Metro Area 2018 and has selected Alan Sloyer, MD for this honor.

Top Doctors: New York Metro Area 2018 includes more than 6,500 top primary care physicians and specialists in a twenty-county area spanning three states: New York, New Jersey, and Connecticut. Selected physicians, including Dr. Sloyer, represent the top 10% of doctors in the area in 67 medical specialties and subspecialties.

Castle Connolly Top Doctors® are selected each year by Castle Connolly Medical Ltd. after being nominated by their peers in an online nomination process. Nominations are open to all licensed MDs and DOs, and each year many tens of thousands of physicians cast hundreds of thousands of nominations. Nominated physicians are selected by the Castle Connolly physician-led research team based on criteria including medical education, training, hospital appointments, disciplinary histories and much more

Castle Connolly Medical Ltd.’s President and CEO Dr. John Connolly has this to say about Dr. Sloyer‘s recognition: “Roughly ten percent of area physicians were selected for our Top Doctors: New York Metro Area 2018. Being nominated by peers and then selected by our experts is an accomplishment worthy of recognition. The New York Metro area is home to a great number of very high-quality medical professionals, yet some stand out. My congratulations to Dr. Sloyer.”

To find out more or to contact Dr. Alan Sloyer, please call 516-487-2444.

Castle Connolly Medical Ltd. identifies Top Doctors in America and provides consumers with detailed information about their education, training and special expertise in their online directory and through print features with magazine and newspaper partner. It is important to note that doctors do not and cannot pay to be included in any Castle Connolly guide or online directory.

North Shore University Photo Contest promotes healing

Alan Sloyer, MD, winner of the 2016 Auxiliary of North Shore University Hospital’s annual photo contest.

Picture this: your photo on the wall at North Shore University Hospital. That’s the prize for winning entries to the Auxiliary of North Shore University Hospital’s annual photo contest.

Find out more



EndoHeroes, are GI professionals who go above and beyond, do their job and also contribute to their community and the well-being of others. They not only offer exceptional patient care, but they are working to improve the lives of others.

EndoChoice, Inc. has established EndoHeroes™, a program to recognize and reward the extraordinary efforts of these GI heroes. We select an EndoHero who is interviewed and recognized with a video profile. Anyone can nominate an EndoHero, and we encourage broad participation in the program.

Once per quarter, we will select one EndoHero who will receive a recognition plaque and a donation – in their name – to the GI society, GI foundation or educational institution of their choice.

GI medicine is not a glamorous field, but it’s one that alleviates pain and saves lives on a daily basis. There are many people who do more than that…who contribute their knowledge and expertise to help their community in other ways, and who make this a better, healthier world.

As a company dedicated to serving the needs of GI professionals, we are proud to be able to recognize the many heroes we encounter, and to help bring their inspirational stories to a wider audience.

Michael’s Mission

For the fifth year, Dr. Alan Sloyer and Michael’s Mission will partner to raise funds to benefit Michael’s Mission. The Spin-a-thon PLUS consists of spin classes interspersed with exercise segments to be held progressively at separate fitness centers on Long Island. Thanks to your support, this event has raised over $ 200,000 since 2005 to raise funds for the fight colorectal cancer.

Inspired by Michael Soussa, who lost his three year battle to colorectal cancer at the age of 33, Michael’s Mission is focused on improving the quality of life and treatment options for those suffering from colorectal cancer through education, research and patient support. Michael’s Mission is a registered 501 (c) (3) nonprofit and all funds raised go directly to patient care and support and research initiatives led by a medical advisory board comprised of leading physicians.

For more information about Michael’s Mission please go to