“Biology of the Enterochromaffin cell”: Trondheim University, Norway.
“Evolution of Pancreatic Neuroendocrine Surgery”: Greek Surgical Society, Thessalonika.
“Management of GERD”: Hyderabad , India.
“Somatostatin Radiopeptide Therapy”: American Society of Clinical Oncology, Atlanta Georgia.
“The Evolution of Acid Suppression”: Jan Mikulicz Memorial Meeting, Wroclaw, Poland.

“Molecular Genetics of Gastric Neoplasia”: Yokohama, Japan.

“The Influence of Edinburgh on the founding of American Medical Schools”: American College of Surgeons/Royale College of Surgeons (Edinburgh).
“The Biology of Carcinoid Disease”: European Neuroendocrine Tumor Society, London.
“The Molecular basis of Carcinoid Fibrosis”: British Society of Surgical Oncology, London.
“Evolution of GI disease management”: American College of Gastroenterology, Orlando.

“The Molecular Basis of the ECL cell”: Per Dubb Oration, University of Gothenburg, Sweden.
Current Status of GERD management. German Endoscopic society, Hamburg.
“The Evolution of Esophageal Therapy”: United European Gastroenterology Weekly, Madrid, Spain.
“From the Mucosa to the Serosa”: Digestive Disease Weekly, Orlando.
“From the Macula to the Mucosa” Royal Society of Medicine, London.
Evolution of Pancreatic Therapy” Dartmouth Grand Rounds – Surgery

Invited speaker, “Cancer of Esophagus and Gastric Cardia: From Gene to Cure,” Amsterdam, the Netherlands
Invited speaker, “Perspectives and reflections on integrated digestive surgery,” The Future of Gastro-Entero-Hepato-Pancreatology is Bright, Amsterdam, the Netherlands
Invited speaker, “Amsterdam and Netherlands Gastroenterology: a historical perspective,” The Future of Gastro-Entero-Hepato-Pancreatology is Bright, Amsterdam, the Netherlands
Invited speaker, “Stem cells and mucosal dynamics: Regulation, repair and neoplasia,” Japanese Society of Ulcer Research
Keynote address, Indian Hepatobiliary Society, “Surgery of chronic pancreatitis”
James IV Oration, Edinburgh, “Molecular strategies and 111In-labeled somatostatin analogs in defining the management of neuroendocrine tumor disease: A new paradigm for surgical management”
External Surgical Assessor, University of Oman

“Gastric Carcinoid Molecular Biology,” Nordic Endocrine Society Meeting, Iceland
Controversies, Problems, and Techniques in Surgery Symposium
Invited Speaker International Pancreatic Meeting, Heidelberg “The surgery of chronic pancreatitis—A chronicle of confusion and despair?”

Invited Speaker: “From k-Ras to Kagoshima,” 100-yearAnniversary of the Japanese Surgical Society: Tokyo
The Eastern Surgical Society: “Beyond Wittgenstein,” New Haven
International Chronic Pancreatitis Symposium, Bern: “The Evolution of Chronic Pancreatitis”
International Esophageal Meeting, Paris: “The Molecular and Historic Basis of Barrett’s Esophagus”
International Helicobacter pylori Meeting, Bermuda: “From the Pump to the Helix”

The Beaumont Lecture
John Callum Memorial Oration

Royal College of Surgeons of England, Hunterian Professorship
Invited Speaker: The F. Troncale Memorial Lecture. “gerd”, New Haven
Invited Speaker: The Dutch Gastro Society: “The Golden Age of Dutch Medicine,” Veldhoven, Holland
Invited Speaker: British Society of Surgery, “Carcinoid Biology and Surgery,” Belfast.
Invited Speaker: Brown University, RI: “The Gordian Conundrum”