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Expert is board certified in internal medicine with a subspecialty in gastroenterology. After receiving his MD from Columbia University, he completed his internship and resident training in medicine at the Veterans Administration Hospital in New York in 1980 where he obtained the Chief Resident in Medicine position his final year. He also completed additional fellowship training in gastroenterology in 1983. He is also certified as a National Board of Medical Examiner.

He has over 32 years in this field and has numerous publications in this field particularly in gastrointestinal endoscopy, gastrointestinal bleeding prevention, jaundice and hepatic artery aneurysm, liver disease, alcoholic cirrhosis, liver abnormality and prolapsed of gastrostomy tube and enteroenteric fistula and intussusception. His professional experience include being an attending gastroenterologist at the VA medical center in Brooklyn for two years, the Director of Endoscopy in the Department of Gastroenterology and being Director of Clinical services for two years at various hopistals in New York. He is also involved in the academic and medical education aspect of his field of expertise as an instructor of medicine and assistant clinical professor at various teaching universities, medical schools and hospitals in New York.

He has given several presentations on the effects of alcohol on the liver, jaundice evaluation and management, gastrointestinal bleeding, tumors of the pancreas, laser relationships to the lumen and lactose intolerance. Some of his past research topics and original papers publications include DNA repair mechanisms in HeLa cells and ultraviolet irradiation in the field of GI pathology, glucocorticoid inhibition of the fibrinolytic activity of tumor cells and the resolution of vitreous hemorrhage. He has also been involved in testing drugs related to gastroenterology studies and surgery including Arbacet and Misoprostol in treating gastrointestinal bleeding.