Alan N. Langnas, DO is Chief of Transplantation and Director of the Liver and Intestinal Transplantation Program at the University of Nebraska Medical Center, Omaha, USA. Professor Langnas has been doing liver transplants at UNMC since 1988 and over the past seven years has performed more than 40 intestinal and intestinal/liver transplants, establishing the UNMC program as one of the top transplant centers in the world performing multiple organ transplants. Along side his transplant work, Professor Langnas also maintains an active practice treating non-transplant hepato-biliary patients and serves on the editorial boards of several medical journals. In addition to writing more than 100 research papers for medical journals, he is also active in several capacities with the United Network for Organ Sharing, the national organ allocation system in the U.S.

Olivier Goulet, MD, PhD Pediatric Gastroenterology-Hepatology and Nutrition, Reference Center for Rare Digestive Diseases, Integrated Program of Intestinal Failure, Home Parenteral Nutrition and Intestinal Transplantation, University of Paris-Descartes, Necker Hospital, Paris, France.

Eamonn M.M. Quigley, MD, FRCP, FACP, FACG, FRCPI is Professor of Medicine and Human Physiology and Head of the Medical School at the National University of Ireland (NUI), Cork. He also serves as Adjunct Professor of Medicine and Physiology at the University of Nebraska Medical Center in Omaha, USA. He is Editor-in-Chief of the American Journal of Gastroenterology and Vice-President of the World Organization of Gastroenterology (OMGE - Organisation Mondiale de Gastroentérologie). His major research interests are in the areas of motility, functional gastrointestinal disorders and gastrointestinal dysfunction in systemic disease. He has published over 400 original papers, reviews, editorials and book chapters and has received numerous awards from universities and societies worldwide.

Kelly A. Tappenden, PhD, RD is Associate Professor of Nutrition and Gastrointestinal Physiology in the Division of Nutritional Sciences at the University of Illinois at Urbana-Champaign, USA. Professor Tappenden recently received the 2005 American Society of Parenteral and Enteral Nutrition Dudrick Research Scholar Award and the 2004 College of Agricultural, Consumer and Environmental Sciences Faculty Award for Excellence in Research. Professor Tappenden's research interests include the regulation of small intestinal function by various nutrients and gastrointestinal-specific pepides. Her recent publications are featured in the Journal of Parenteral and Enteral Nutrition, Journal of Pediatric Gastroenterology and Nutrition and Journal of Nutrition. In addition to her academic research, Professor Tappenden is also a Registered Dietician, having completed clinical training at the Misericordia Hospital in Edmonton, Alberta.