Pierre A. Russo, MD, is Professor of Pathology and Laboratory Medicine at the University of Pennsylvania School of Medicine and Director of Anatomic Pathology, at the Children's Hospital of Philadelphia. In the latter role he oversees a staff of 40 staff pathologists and technicians and trains fellows and residents in pediatric pathology. Additionally, Professor Russo is Co-Chair of the Pathology Committee for the Childhood Liver Disease Research and Education Network (ChiLDREN). He is board certified by the American Board of Pathology/Anatomic and Clinical Pathology and the American Board of Pathology/Pediatric Pathology. His main interest is the pathology of hepatobiliary and digestive disorders in children, and his research has in particular focused on the mechanisms of cholestasis and on bile duct disorders.Eduardo Ruchelli, MD, is Associate Professor of Pathology and Laboratory Medicine at the University of Pennsylvania School of Medicine, and Attending Pathologist as well as Director of the Pediatric Pathology Fellowship Program at the Children’s Hospital of Philadelphia. He is board certified by the American Board of Pathology/Anatomic and Clinical Pathology and the American Board of Pathology/Pediatric Pathology. His special interests include fetal and perinatal pathology, pathologic evaluation of the pancreas in congenital hyperinsulinism, and eosinophilic esophagitis. He has published widely on these and other subjects in peer-reviewed journals.David Piccoli, MD, is Professor of Pediatrics at the University of Pennsylvania School of Medicine and Chief of the Division of Gastroenterology, Hepatology, and Nutrition at the Children’s Hospital of Philadelphia. He is also Director of the Fred and Suzanne Biesecker Pediatric Liver Center and Associate Chair for Information, Department of Pediatrics, The Children’s Hospital of Philadelphia. He is board certified by the American Board of Pediatrics and the American Board of Pediatrics/Pediatric Gastroenterology. His special interests include Alagille syndrome, bile duct disorders, and inflammatory bowel disease, and he has published extensively on these and other topics. Professor Piccoli has also been the recipient of various awards, including the Outstanding Leadership Award from the Crohn's and Colitis Foundation of America.