Our Staff

Our Staff

Dr. Fagan

Dr. Ronald Fagan is the head gastroenterologist, internist and primary care physician at LI Medical Group, which is located on the Hempstead Turnpike in Bethpage Farmingdale, New York (Long Island).

Dr. Fagan received his medical degree at the Universidad Autonoma de Guadalajara in Mexico. Following a stint at Long Island Jewish Medical Center (to finish his residency), he worked at the Brooklyn Hospital Center to complete a gastroenterology fellowship.

Read More

Dr. Stuart Horowitz

Dr. Stuart Horowitz was board certified in family medical practice in 1985 and boasts nearly 30 years of experience working in Long Island. A Brooklyn native who grew up in Long Island. After completing his undergraduate studies at Hofstra University, Dr. Horowitz received his medical degree from the College of Osteopathic Medicine and Surgery in Iowa in 1977. He then finished his internship at three different hospitals: Interboro Hospital, Massapequa General Hospital and Long Island Jewish Hospital.

Read More

Dr Orlando Suarez

Dr. Orlando Suarez

Dr. Orlando Suarez has been serving the people of New York for years as a primary care physician and internist. Dr. Suarez completed his medical degree at Universidad de Ciencias Médicas de Villa Clara Facultad de Medicina. He then completed his residency in internal medicine at New York University.

Dr. Suarez is also a member of the American Medical Association and the American College of Physicians
Dr. Suarez is a trusted internist for the Long Island community and helps patients with general consultations, joint problems, nausea and vomiting, sports medicine consultations, urology problems, and pediatric obesity consultations.

Read More

Dr. Marc Rybstein

Dr. Marc Rybstein is a Long Island native and received his Bachelor’s of Science in Chemistry from New York University. There, he published multiple articles on chemistry and DNA in journals like the Journal of Inorganic Chemistry.

Afterwards, Dr. Rybstein enrolled in Stony Brook University Medical School, where his passion for cardiovascular disease – and especially preventive cardiology – was born. He completed his residency at Manhattan’s Lenox Hill Hospital. Dr. Rybstein went on to acquire more knowledge about this field by partaking in many research projects pertaining to the risk factors for ischemic heart disease.

Read More


What Our Clients Say about our services

I have been a patient of Dr.Fagan for years. His entire staff from the the front desk to the medical assistants are always pleasant and professional...

Andrie Clemmons

Dr. Fagan was very knowledgeable and he provided a lot of information. In addition he listened to all of the concerns presented...

Daniel Noor

Just for having the dogs alone would be enough reason for me to go there. EVERY office should be allowed to have dogs allowed to...

Margaret London

Dr. Fagan was very friendly, I scheduled my appointment same day and was able to get blood work, an x ray, a sonogram and allergy...

Emily Shogan


4 Apr

Allergy Testing- Why And When Should You Go For It?

Allergy is a condition in which the immune system of a human body…

Read More
17 Jan

When Should You See A Gastroenterologist?

A gastroenterologist is a medical practitioner who focuses on…

Read More
Stroke Prevention | LI Medical Group
10 Oct

Learn Exactly How To Improve Stroke Prevention

A stroke is a potentially fatal medical condition that occurs when the blood…

Read More