Our Medical Team


Dr. Moshe Hirth is a Board Certified Gastroenterologist from the suburb of Tel Aviv in Israel. He attended the Sackler School of Medicine in Israel and graduated from New York Medical College in 1988. 


Dr. Leonard Flescher is a Board Certified Gastroenterologist who was born in New York and completed his medical education at New York Medical College.


Dr. Chamberlain holds an MD from Harvard Medical School and is Board Certified in Gastroenterology and Internal Medicine.

Sari M. Kay, MD is a board-certified Pediatric Gastroenterologist. She received her undergraduate degree in neurobiology from the University of Wisconsin-Madison and went on to medical school at Tel Aviv University

Laura E. Irastorza, MD is a board-eligible Pediatric Gastroenterologist. She is a native Floridian and attended Florida State University where she received both her undergraduate degree in Exercise Science as well as her Doctorate of Medicine.

Dr. Steven Kirschner obtained his medical degree from Universidad Nordestana. He completed his internal medicine residency and gastroenterology fellowship at Downstate Medical Center in Brooklyn, New York.

Trained in Cambridge, England, Dr. Basu initially specialized in infectious diseases and tropical medicine. He traveled in South-East Asia treating viral diseases of the liver, particularly, Hepatitis-B and other parasitic liver diseases.


Andrea Ristaino, CRNP earned her Bachelor’s Degree in Nursing from Florida State University College of Nursing in 2010. She has been with Palm Beach Digestive Associates for 3 years. She went on to earn her Master’s Degree as a Family Nurse Practitioner at FIU in 2015.


Ashley Gomberg, CRNP earned her Bachelors Degree in Nursing from the University of Florida School of Nursing in 2006. She went on to earn her Masters Degree in Nursing from Johns Hopkins University in 2009 and is a certified Nurse Practitioner.