Current research interests include the elucidation of the growth factor mediated transformation process of the enterochromaffin-like cell (ECL) and the development of intravenous receptor targeted isotopic neuroendocrine tumor irradiation. His recent books include: “Laparoscopic Surgery,” “From Prout to the Proton Pump,” “Acid Related Disease: Biology and Treatment,” “The History of Endoscopy,” “The Logic of Omeprazole,” “The History of Gastroenterology,” and “The Evolution of Therapy in Gastroenterology.” He has also written a series of medical travel and historical books on Rome (“From Galen to Glory”), Vienna (“From Billroth to Boas”), New Orleans (“Medicine on the Mississippi”), and Washingtonian medicine (“Medical Milestones on the Potomac”).