Author of 307 full-length papers published in medical journals as listed in PubMed.  Author of 11 books or monographs published in the field of gastroenterology. Member, editorial board of World Journal of Gastroenterology, starting January 2021.  Full professor, Oakland University William Beaumont School of Medicine, Royal Oak, Michigan 2009-current; Gastroenterology Fellowship Program Director, William Beaumont Hospital at Royal Oak, Michigan 2006-current; and Co-director, second year medical school course in Gastroenterology and Hepatology at Oakland University William Beaumont School of Medicine, 2010-current; Food and Drug Administration Advisory Committee on Gastrointestinal Drugs, 2015-2019; Chief, Division of Gastroenterology & Hepatology, and Gastroenterology Fellowship Program Director, William Beaumont Hospital at Royal Oak 2006-2019; Director, Gastroenterology Fellowship Training Program, Albert Einstein Medical Center, Philadelphia, Pennsylvania, 2004-2006; Chief, Division of Gastroenterology, St. Barnabas Medical Center, Bronx, New York, 2003-2004.  Chief, Division of Gastroenterology, Woodhull Medical Center, Bronx, New York, 2000-2003 and Residency Program Director, Department of Medicine, and Vice Chairman of Medicine, Woodhull Medical Center, 2001-2003; Associate Director, Division of Gastroenterology, Maimonides Medical Center and Associate Professor of Medicine, Downstate Medical Center, Brooklyn, New York, 1995-2000; Assistant Professor, Division of Gastroenterology, Rutgers-Robert Wood Johnson Medical School, New Brunswick, New Jersey 1988-1995; Director of Gastrointestinal Endoscopy Unit, Jacobi Hospital, and Assistant Professor, Albert Einstein College of Medicine, Bronx, New York 1986-1988.  Gastroenterology fellowship performed from 1984-1986 at Columbia Presbyterian Medical Center, New York, New York, with graduation in June 1986. Residency performed at Montefiore Medical Center in Bronx, New York from 1981-1984 with graduation in June 1984.  Graduated from Albert Einstein College of Medicine in Bronx, New York with an MD awarded in 1981 and a PhD awarded in 1984.  Awarded Medical Scientist Training Program scholarship for a combined MD-PhD (which included free medical school tuition and an annual stipend) while attending Albert Einstein College of Medicine, 1974-1981.  Attended Columbia College, in New York, New York from 1970-1974 with majors in mathematics and biology and graduated summa cum laud and phi beta kappa from Columbia College.