In Memoriam^†

EDITOR'S NOTE: As a testament to Dr Kirsner's contributions to our field at large, this commentary is being jointly published in the November 2012 issue of the following journals (as unanimously agreed upon by the respective editors): American Journal of Gastroenterology, Clinical Gastroenterology and Hepatology, Digestive Diseases and Sciences, Gastroenterology, Gut, and Inflammatory Bowel Diseases.